ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.c
Revision: 1.382
Committed: Thu Jun 30 13:13:59 2011 UTC (13 years ago) by sf-exg
Content type: text/plain
Branch: MAIN
Changes since 1.381: +1 -1 lines
Log Message:
Add unused attribute to ocur_ variable.

File Contents

# Content
1 /*
2 * libev event processing core, watcher management
3 *
4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
40 /* this big block deduces configuration from config.h */
41 #ifndef EV_STANDALONE
42 # ifdef EV_CONFIG_H
43 # include EV_CONFIG_H
44 # else
45 # include "config.h"
46 # endif
47
48 #if HAVE_FLOOR
49 # ifndef EV_USE_FLOOR
50 # define EV_USE_FLOOR 1
51 # endif
52 #endif
53
54 # if HAVE_CLOCK_SYSCALL
55 # ifndef EV_USE_CLOCK_SYSCALL
56 # define EV_USE_CLOCK_SYSCALL 1
57 # ifndef EV_USE_REALTIME
58 # define EV_USE_REALTIME 0
59 # endif
60 # ifndef EV_USE_MONOTONIC
61 # define EV_USE_MONOTONIC 1
62 # endif
63 # endif
64 # elif !defined(EV_USE_CLOCK_SYSCALL)
65 # define EV_USE_CLOCK_SYSCALL 0
66 # endif
67
68 # if HAVE_CLOCK_GETTIME
69 # ifndef EV_USE_MONOTONIC
70 # define EV_USE_MONOTONIC 1
71 # endif
72 # ifndef EV_USE_REALTIME
73 # define EV_USE_REALTIME 0
74 # endif
75 # else
76 # ifndef EV_USE_MONOTONIC
77 # define EV_USE_MONOTONIC 0
78 # endif
79 # ifndef EV_USE_REALTIME
80 # define EV_USE_REALTIME 0
81 # endif
82 # endif
83
84 # if HAVE_NANOSLEEP
85 # ifndef EV_USE_NANOSLEEP
86 # define EV_USE_NANOSLEEP EV_FEATURE_OS
87 # endif
88 # else
89 # undef EV_USE_NANOSLEEP
90 # define EV_USE_NANOSLEEP 0
91 # endif
92
93 # if HAVE_SELECT && HAVE_SYS_SELECT_H
94 # ifndef EV_USE_SELECT
95 # define EV_USE_SELECT EV_FEATURE_BACKENDS
96 # endif
97 # else
98 # undef EV_USE_SELECT
99 # define EV_USE_SELECT 0
100 # endif
101
102 # if HAVE_POLL && HAVE_POLL_H
103 # ifndef EV_USE_POLL
104 # define EV_USE_POLL EV_FEATURE_BACKENDS
105 # endif
106 # else
107 # undef EV_USE_POLL
108 # define EV_USE_POLL 0
109 # endif
110
111 # if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
112 # ifndef EV_USE_EPOLL
113 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
114 # endif
115 # else
116 # undef EV_USE_EPOLL
117 # define EV_USE_EPOLL 0
118 # endif
119
120 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
121 # ifndef EV_USE_KQUEUE
122 # define EV_USE_KQUEUE EV_FEATURE_BACKENDS
123 # endif
124 # else
125 # undef EV_USE_KQUEUE
126 # define EV_USE_KQUEUE 0
127 # endif
128
129 # if HAVE_PORT_H && HAVE_PORT_CREATE
130 # ifndef EV_USE_PORT
131 # define EV_USE_PORT EV_FEATURE_BACKENDS
132 # endif
133 # else
134 # undef EV_USE_PORT
135 # define EV_USE_PORT 0
136 # endif
137
138 # if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
139 # ifndef EV_USE_INOTIFY
140 # define EV_USE_INOTIFY EV_FEATURE_OS
141 # endif
142 # else
143 # undef EV_USE_INOTIFY
144 # define EV_USE_INOTIFY 0
145 # endif
146
147 # if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
148 # ifndef EV_USE_SIGNALFD
149 # define EV_USE_SIGNALFD EV_FEATURE_OS
150 # endif
151 # else
152 # undef EV_USE_SIGNALFD
153 # define EV_USE_SIGNALFD 0
154 # endif
155
156 # if HAVE_EVENTFD
157 # ifndef EV_USE_EVENTFD
158 # define EV_USE_EVENTFD EV_FEATURE_OS
159 # endif
160 # else
161 # undef EV_USE_EVENTFD
162 # define EV_USE_EVENTFD 0
163 # endif
164
165 #endif
166
167 #include <stdlib.h>
168 #include <string.h>
169 #include <fcntl.h>
170 #include <stddef.h>
171
172 #include <stdio.h>
173
174 #include <assert.h>
175 #include <errno.h>
176 #include <sys/types.h>
177 #include <time.h>
178 #include <limits.h>
179
180 #include <signal.h>
181
182 #ifdef EV_H
183 # include EV_H
184 #else
185 # include "ev.h"
186 #endif
187
188 EV_CPP(extern "C" {)
189
190 #ifndef _WIN32
191 # include <sys/time.h>
192 # include <sys/wait.h>
193 # include <unistd.h>
194 #else
195 # include <io.h>
196 # define WIN32_LEAN_AND_MEAN
197 # include <windows.h>
198 # ifndef EV_SELECT_IS_WINSOCKET
199 # define EV_SELECT_IS_WINSOCKET 1
200 # endif
201 # undef EV_AVOID_STDIO
202 #endif
203
204 /* OS X, in its infinite idiocy, actually HARDCODES
205 * a limit of 1024 into their select. Where people have brains,
206 * OS X engineers apparently have a vacuum. Or maybe they were
207 * ordered to have a vacuum, or they do anything for money.
208 * This might help. Or not.
209 */
210 #define _DARWIN_UNLIMITED_SELECT 1
211
212 /* this block tries to deduce configuration from header-defined symbols and defaults */
213
214 /* try to deduce the maximum number of signals on this platform */
215 #if defined (EV_NSIG)
216 /* use what's provided */
217 #elif defined (NSIG)
218 # define EV_NSIG (NSIG)
219 #elif defined(_NSIG)
220 # define EV_NSIG (_NSIG)
221 #elif defined (SIGMAX)
222 # define EV_NSIG (SIGMAX+1)
223 #elif defined (SIG_MAX)
224 # define EV_NSIG (SIG_MAX+1)
225 #elif defined (_SIG_MAX)
226 # define EV_NSIG (_SIG_MAX+1)
227 #elif defined (MAXSIG)
228 # define EV_NSIG (MAXSIG+1)
229 #elif defined (MAX_SIG)
230 # define EV_NSIG (MAX_SIG+1)
231 #elif defined (SIGARRAYSIZE)
232 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
233 #elif defined (_sys_nsig)
234 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
235 #else
236 # error "unable to find value for NSIG, please report"
237 /* to make it compile regardless, just remove the above line, */
238 /* but consider reporting it, too! :) */
239 # define EV_NSIG 65
240 #endif
241
242 #ifndef EV_USE_FLOOR
243 # define EV_USE_FLOOR 0
244 #endif
245
246 #ifndef EV_USE_CLOCK_SYSCALL
247 # if __linux && __GLIBC__ >= 2
248 # define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
249 # else
250 # define EV_USE_CLOCK_SYSCALL 0
251 # endif
252 #endif
253
254 #ifndef EV_USE_MONOTONIC
255 # if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
256 # define EV_USE_MONOTONIC EV_FEATURE_OS
257 # else
258 # define EV_USE_MONOTONIC 0
259 # endif
260 #endif
261
262 #ifndef EV_USE_REALTIME
263 # define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
264 #endif
265
266 #ifndef EV_USE_NANOSLEEP
267 # if _POSIX_C_SOURCE >= 199309L
268 # define EV_USE_NANOSLEEP EV_FEATURE_OS
269 # else
270 # define EV_USE_NANOSLEEP 0
271 # endif
272 #endif
273
274 #ifndef EV_USE_SELECT
275 # define EV_USE_SELECT EV_FEATURE_BACKENDS
276 #endif
277
278 #ifndef EV_USE_POLL
279 # ifdef _WIN32
280 # define EV_USE_POLL 0
281 # else
282 # define EV_USE_POLL EV_FEATURE_BACKENDS
283 # endif
284 #endif
285
286 #ifndef EV_USE_EPOLL
287 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
288 # define EV_USE_EPOLL EV_FEATURE_BACKENDS
289 # else
290 # define EV_USE_EPOLL 0
291 # endif
292 #endif
293
294 #ifndef EV_USE_KQUEUE
295 # define EV_USE_KQUEUE 0
296 #endif
297
298 #ifndef EV_USE_PORT
299 # define EV_USE_PORT 0
300 #endif
301
302 #ifndef EV_USE_INOTIFY
303 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
304 # define EV_USE_INOTIFY EV_FEATURE_OS
305 # else
306 # define EV_USE_INOTIFY 0
307 # endif
308 #endif
309
310 #ifndef EV_PID_HASHSIZE
311 # define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
312 #endif
313
314 #ifndef EV_INOTIFY_HASHSIZE
315 # define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
316 #endif
317
318 #ifndef EV_USE_EVENTFD
319 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
320 # define EV_USE_EVENTFD EV_FEATURE_OS
321 # else
322 # define EV_USE_EVENTFD 0
323 # endif
324 #endif
325
326 #ifndef EV_USE_SIGNALFD
327 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
328 # define EV_USE_SIGNALFD EV_FEATURE_OS
329 # else
330 # define EV_USE_SIGNALFD 0
331 # endif
332 #endif
333
334 #if 0 /* debugging */
335 # define EV_VERIFY 3
336 # define EV_USE_4HEAP 1
337 # define EV_HEAP_CACHE_AT 1
338 #endif
339
340 #ifndef EV_VERIFY
341 # define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
342 #endif
343
344 #ifndef EV_USE_4HEAP
345 # define EV_USE_4HEAP EV_FEATURE_DATA
346 #endif
347
348 #ifndef EV_HEAP_CACHE_AT
349 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
350 #endif
351
352 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
353 /* which makes programs even slower. might work on other unices, too. */
354 #if EV_USE_CLOCK_SYSCALL
355 # include <syscall.h>
356 # ifdef SYS_clock_gettime
357 # define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
358 # undef EV_USE_MONOTONIC
359 # define EV_USE_MONOTONIC 1
360 # else
361 # undef EV_USE_CLOCK_SYSCALL
362 # define EV_USE_CLOCK_SYSCALL 0
363 # endif
364 #endif
365
366 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
367
368 #ifdef _AIX
369 /* AIX has a completely broken poll.h header */
370 # undef EV_USE_POLL
371 # define EV_USE_POLL 0
372 #endif
373
374 #ifndef CLOCK_MONOTONIC
375 # undef EV_USE_MONOTONIC
376 # define EV_USE_MONOTONIC 0
377 #endif
378
379 #ifndef CLOCK_REALTIME
380 # undef EV_USE_REALTIME
381 # define EV_USE_REALTIME 0
382 #endif
383
384 #if !EV_STAT_ENABLE
385 # undef EV_USE_INOTIFY
386 # define EV_USE_INOTIFY 0
387 #endif
388
389 #if !EV_USE_NANOSLEEP
390 /* hp-ux has it in sys/time.h, which we unconditionally include above */
391 # if !defined(_WIN32) && !defined(__hpux)
392 # include <sys/select.h>
393 # endif
394 #endif
395
396 #if EV_USE_INOTIFY
397 # include <sys/statfs.h>
398 # include <sys/inotify.h>
399 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
400 # ifndef IN_DONT_FOLLOW
401 # undef EV_USE_INOTIFY
402 # define EV_USE_INOTIFY 0
403 # endif
404 #endif
405
406 #if EV_SELECT_IS_WINSOCKET
407 # include <winsock.h>
408 #endif
409
410 #if EV_USE_EVENTFD
411 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
412 # include <stdint.h>
413 # ifndef EFD_NONBLOCK
414 # define EFD_NONBLOCK O_NONBLOCK
415 # endif
416 # ifndef EFD_CLOEXEC
417 # ifdef O_CLOEXEC
418 # define EFD_CLOEXEC O_CLOEXEC
419 # else
420 # define EFD_CLOEXEC 02000000
421 # endif
422 # endif
423 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
424 #endif
425
426 #if EV_USE_SIGNALFD
427 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
428 # include <stdint.h>
429 # ifndef SFD_NONBLOCK
430 # define SFD_NONBLOCK O_NONBLOCK
431 # endif
432 # ifndef SFD_CLOEXEC
433 # ifdef O_CLOEXEC
434 # define SFD_CLOEXEC O_CLOEXEC
435 # else
436 # define SFD_CLOEXEC 02000000
437 # endif
438 # endif
439 EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
440
441 struct signalfd_siginfo
442 {
443 uint32_t ssi_signo;
444 char pad[128 - sizeof (uint32_t)];
445 };
446 #endif
447
448 /**/
449
450 #if EV_VERIFY >= 3
451 # define EV_FREQUENT_CHECK ev_verify (EV_A)
452 #else
453 # define EV_FREQUENT_CHECK do { } while (0)
454 #endif
455
456 /*
457 * This is used to work around floating point rounding problems.
458 * This value is good at least till the year 4000.
459 */
460 #define MIN_INTERVAL 0.0001220703125 /* 1/2**13, good till 4000 */
461 /*#define MIN_INTERVAL 0.00000095367431640625 /* 1/2**20, good till 2200 */
462
463 #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
464 #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
465
466 #define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
467 #define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
468
469 /* the following are taken from libecb */
470 /* ecb.h start */
471
472 /* many compilers define _GNUC_ to some versions but then only implement
473 * what their idiot authors think are the "more important" extensions,
474 * causing enourmous grief in return for some better fake benchmark numbers.
475 * or so.
476 * we try to detect these and simply assume they are not gcc - if they have
477 * an issue with that they should have done it right in the first place.
478 */
479 #ifndef ECB_GCC_VERSION
480 #if !defined(__GNUC_MINOR__) || defined(__INTEL_COMPILER) || defined(__SUNPRO_C) || defined(__SUNPRO_CC) || defined(__llvm__) || defined(__clang__)
481 #define ECB_GCC_VERSION(major,minor) 0
482 #else
483 #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
484 #endif
485 #endif
486
487 #if __cplusplus
488 #define ecb_inline static inline
489 #elif ECB_GCC_VERSION(2,5)
490 #define ecb_inline static __inline__
491 #elif ECB_C99
492 #define ecb_inline static inline
493 #else
494 #define ecb_inline static
495 #endif
496
497 #if ECB_GCC_VERSION(3,1)
498 #define ecb_attribute(attrlist) __attribute__(attrlist)
499 #define ecb_is_constant(expr) __builtin_constant_p (expr)
500 #define ecb_expect(expr,value) __builtin_expect ((expr),(value))
501 #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
502 #else
503 #define ecb_attribute(attrlist)
504 #define ecb_is_constant(expr) 0
505 #define ecb_expect(expr,value) (expr)
506 #define ecb_prefetch(addr,rw,locality)
507 #endif
508
509 #define ecb_noinline ecb_attribute ((__noinline__))
510 #define ecb_noreturn ecb_attribute ((__noreturn__))
511 #define ecb_unused ecb_attribute ((__unused__))
512 #define ecb_const ecb_attribute ((__const__))
513 #define ecb_pure ecb_attribute ((__pure__))
514
515 #if ECB_GCC_VERSION(4,3)
516 #define ecb_artificial ecb_attribute ((__artificial__))
517 #define ecb_hot ecb_attribute ((__hot__))
518 #define ecb_cold ecb_attribute ((__cold__))
519 #else
520 #define ecb_artificial
521 #define ecb_hot
522 #define ecb_cold
523 #endif
524
525 /* put around conditional expressions if you are very sure that the */
526 /* expression is mostly true or mostly false. note that these return */
527 /* booleans, not the expression. */
528 #define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
529 #define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
530 /* ecb.h end */
531
532 #define expect_false(cond) ecb_expect_false (cond)
533 #define expect_true(cond) ecb_expect_true (cond)
534 #define noinline ecb_noinline
535
536 #define inline_size ecb_inline
537
538 #if EV_FEATURE_CODE
539 # define inline_speed ecb_inline
540 #else
541 # define inline_speed static noinline
542 #endif
543
544 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
545
546 #if EV_MINPRI == EV_MAXPRI
547 # define ABSPRI(w) (((W)w), 0)
548 #else
549 # define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
550 #endif
551
552 #define EMPTY /* required for microsofts broken pseudo-c compiler */
553 #define EMPTY2(a,b) /* used to suppress some warnings */
554
555 typedef ev_watcher *W;
556 typedef ev_watcher_list *WL;
557 typedef ev_watcher_time *WT;
558
559 #define ev_active(w) ((W)(w))->active
560 #define ev_at(w) ((WT)(w))->at
561
562 #if EV_USE_REALTIME
563 /* sig_atomic_t is used to avoid per-thread variables or locking but still */
564 /* giving it a reasonably high chance of working on typical architectures */
565 static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
566 #endif
567
568 #if EV_USE_MONOTONIC
569 static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
570 #endif
571
572 #ifndef EV_FD_TO_WIN32_HANDLE
573 # define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
574 #endif
575 #ifndef EV_WIN32_HANDLE_TO_FD
576 # define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
577 #endif
578 #ifndef EV_WIN32_CLOSE_FD
579 # define EV_WIN32_CLOSE_FD(fd) close (fd)
580 #endif
581
582 #ifdef _WIN32
583 # include "ev_win32.c"
584 #endif
585
586 /*****************************************************************************/
587
588 /* define a suitable floor function (only used by periodics atm) */
589
590 #if EV_USE_FLOOR
591 # include <math.h>
592 # define ev_floor(v) floor (v)
593 #else
594
595 #include <float.h>
596
597 /* a floor() replacement function, should be independent of ev_tstamp type */
598 static ev_tstamp noinline
599 ev_floor (ev_tstamp v)
600 {
601 /* the choice of shift factor is not terribly important */
602 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
603 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
604 #else
605 const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
606 #endif
607
608 /* argument too large for an unsigned long? */
609 if (expect_false (v >= shift))
610 {
611 ev_tstamp f;
612
613 if (v == v - 1.)
614 return v; /* very large number */
615
616 f = shift * ev_floor (v * (1. / shift));
617 return f + ev_floor (v - f);
618 }
619
620 /* special treatment for negative args? */
621 if (expect_false (v < 0.))
622 {
623 ev_tstamp f = -ev_floor (-v);
624
625 return f - (f == v ? 0 : 1);
626 }
627
628 /* fits into an unsigned long */
629 return (unsigned long)v;
630 }
631
632 #endif
633
634 /*****************************************************************************/
635
636 #ifdef __linux
637 # include <sys/utsname.h>
638 #endif
639
640 static unsigned int noinline ecb_cold
641 ev_linux_version (void)
642 {
643 #ifdef __linux
644 unsigned int v = 0;
645 struct utsname buf;
646 int i;
647 char *p = buf.release;
648
649 if (uname (&buf))
650 return 0;
651
652 for (i = 3+1; --i; )
653 {
654 unsigned int c = 0;
655
656 for (;;)
657 {
658 if (*p >= '0' && *p <= '9')
659 c = c * 10 + *p++ - '0';
660 else
661 {
662 p += *p == '.';
663 break;
664 }
665 }
666
667 v = (v << 8) | c;
668 }
669
670 return v;
671 #else
672 return 0;
673 #endif
674 }
675
676 /*****************************************************************************/
677
678 #if EV_AVOID_STDIO
679 static void noinline ecb_cold
680 ev_printerr (const char *msg)
681 {
682 write (STDERR_FILENO, msg, strlen (msg));
683 }
684 #endif
685
686 static void (*syserr_cb)(const char *msg);
687
688 void ecb_cold
689 ev_set_syserr_cb (void (*cb)(const char *msg))
690 {
691 syserr_cb = cb;
692 }
693
694 static void noinline ecb_cold
695 ev_syserr (const char *msg)
696 {
697 if (!msg)
698 msg = "(libev) system error";
699
700 if (syserr_cb)
701 syserr_cb (msg);
702 else
703 {
704 #if EV_AVOID_STDIO
705 ev_printerr (msg);
706 ev_printerr (": ");
707 ev_printerr (strerror (errno));
708 ev_printerr ("\n");
709 #else
710 perror (msg);
711 #endif
712 abort ();
713 }
714 }
715
716 static void *
717 ev_realloc_emul (void *ptr, long size)
718 {
719 #if __GLIBC__
720 return realloc (ptr, size);
721 #else
722 /* some systems, notably openbsd and darwin, fail to properly
723 * implement realloc (x, 0) (as required by both ansi c-89 and
724 * the single unix specification, so work around them here.
725 */
726
727 if (size)
728 return realloc (ptr, size);
729
730 free (ptr);
731 return 0;
732 #endif
733 }
734
735 static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
736
737 void ecb_cold
738 ev_set_allocator (void *(*cb)(void *ptr, long size))
739 {
740 alloc = cb;
741 }
742
743 inline_speed void *
744 ev_realloc (void *ptr, long size)
745 {
746 ptr = alloc (ptr, size);
747
748 if (!ptr && size)
749 {
750 #if EV_AVOID_STDIO
751 ev_printerr ("(libev) memory allocation failed, aborting.\n");
752 #else
753 fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
754 #endif
755 abort ();
756 }
757
758 return ptr;
759 }
760
761 #define ev_malloc(size) ev_realloc (0, (size))
762 #define ev_free(ptr) ev_realloc ((ptr), 0)
763
764 /*****************************************************************************/
765
766 /* set in reify when reification needed */
767 #define EV_ANFD_REIFY 1
768
769 /* file descriptor info structure */
770 typedef struct
771 {
772 WL head;
773 unsigned char events; /* the events watched for */
774 unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
775 unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
776 unsigned char unused;
777 #if EV_USE_EPOLL
778 unsigned int egen; /* generation counter to counter epoll bugs */
779 #endif
780 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
781 SOCKET handle;
782 #endif
783 #if EV_USE_IOCP
784 OVERLAPPED or, ow;
785 #endif
786 } ANFD;
787
788 /* stores the pending event set for a given watcher */
789 typedef struct
790 {
791 W w;
792 int events; /* the pending event set for the given watcher */
793 } ANPENDING;
794
795 #if EV_USE_INOTIFY
796 /* hash table entry per inotify-id */
797 typedef struct
798 {
799 WL head;
800 } ANFS;
801 #endif
802
803 /* Heap Entry */
804 #if EV_HEAP_CACHE_AT
805 /* a heap element */
806 typedef struct {
807 ev_tstamp at;
808 WT w;
809 } ANHE;
810
811 #define ANHE_w(he) (he).w /* access watcher, read-write */
812 #define ANHE_at(he) (he).at /* access cached at, read-only */
813 #define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
814 #else
815 /* a heap element */
816 typedef WT ANHE;
817
818 #define ANHE_w(he) (he)
819 #define ANHE_at(he) (he)->at
820 #define ANHE_at_cache(he)
821 #endif
822
823 #if EV_MULTIPLICITY
824
825 struct ev_loop
826 {
827 ev_tstamp ev_rt_now;
828 #define ev_rt_now ((loop)->ev_rt_now)
829 #define VAR(name,decl) decl;
830 #include "ev_vars.h"
831 #undef VAR
832 };
833 #include "ev_wrap.h"
834
835 static struct ev_loop default_loop_struct;
836 struct ev_loop *ev_default_loop_ptr;
837
838 #else
839
840 ev_tstamp ev_rt_now;
841 #define VAR(name,decl) static decl;
842 #include "ev_vars.h"
843 #undef VAR
844
845 static int ev_default_loop_ptr;
846
847 #endif
848
849 #if EV_FEATURE_API
850 # define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
851 # define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
852 # define EV_INVOKE_PENDING invoke_cb (EV_A)
853 #else
854 # define EV_RELEASE_CB (void)0
855 # define EV_ACQUIRE_CB (void)0
856 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
857 #endif
858
859 #define EVBREAK_RECURSE 0x80
860
861 /*****************************************************************************/
862
863 #ifndef EV_HAVE_EV_TIME
864 ev_tstamp
865 ev_time (void)
866 {
867 #if EV_USE_REALTIME
868 if (expect_true (have_realtime))
869 {
870 struct timespec ts;
871 clock_gettime (CLOCK_REALTIME, &ts);
872 return ts.tv_sec + ts.tv_nsec * 1e-9;
873 }
874 #endif
875
876 struct timeval tv;
877 gettimeofday (&tv, 0);
878 return tv.tv_sec + tv.tv_usec * 1e-6;
879 }
880 #endif
881
882 inline_size ev_tstamp
883 get_clock (void)
884 {
885 #if EV_USE_MONOTONIC
886 if (expect_true (have_monotonic))
887 {
888 struct timespec ts;
889 clock_gettime (CLOCK_MONOTONIC, &ts);
890 return ts.tv_sec + ts.tv_nsec * 1e-9;
891 }
892 #endif
893
894 return ev_time ();
895 }
896
897 #if EV_MULTIPLICITY
898 ev_tstamp
899 ev_now (EV_P)
900 {
901 return ev_rt_now;
902 }
903 #endif
904
905 void
906 ev_sleep (ev_tstamp delay)
907 {
908 if (delay > 0.)
909 {
910 #if EV_USE_NANOSLEEP
911 struct timespec ts;
912
913 EV_TS_SET (ts, delay);
914 nanosleep (&ts, 0);
915 #elif defined(_WIN32)
916 Sleep ((unsigned long)(delay * 1e3));
917 #else
918 struct timeval tv;
919
920 /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
921 /* something not guaranteed by newer posix versions, but guaranteed */
922 /* by older ones */
923 EV_TV_SET (tv, delay);
924 select (0, 0, 0, 0, &tv);
925 #endif
926 }
927 }
928
929 /*****************************************************************************/
930
931 #define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
932
933 /* find a suitable new size for the given array, */
934 /* hopefully by rounding to a nice-to-malloc size */
935 inline_size int
936 array_nextsize (int elem, int cur, int cnt)
937 {
938 int ncur = cur + 1;
939
940 do
941 ncur <<= 1;
942 while (cnt > ncur);
943
944 /* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
945 if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
946 {
947 ncur *= elem;
948 ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
949 ncur = ncur - sizeof (void *) * 4;
950 ncur /= elem;
951 }
952
953 return ncur;
954 }
955
956 static void * noinline ecb_cold
957 array_realloc (int elem, void *base, int *cur, int cnt)
958 {
959 *cur = array_nextsize (elem, *cur, cnt);
960 return ev_realloc (base, elem * *cur);
961 }
962
963 #define array_init_zero(base,count) \
964 memset ((void *)(base), 0, sizeof (*(base)) * (count))
965
966 #define array_needsize(type,base,cur,cnt,init) \
967 if (expect_false ((cnt) > (cur))) \
968 { \
969 int ecb_unused ocur_ = (cur); \
970 (base) = (type *)array_realloc \
971 (sizeof (type), (base), &(cur), (cnt)); \
972 init ((base) + (ocur_), (cur) - ocur_); \
973 }
974
975 #if 0
976 #define array_slim(type,stem) \
977 if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
978 { \
979 stem ## max = array_roundsize (stem ## cnt >> 1); \
980 base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
981 fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
982 }
983 #endif
984
985 #define array_free(stem, idx) \
986 ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
987
988 /*****************************************************************************/
989
990 /* dummy callback for pending events */
991 static void noinline
992 pendingcb (EV_P_ ev_prepare *w, int revents)
993 {
994 }
995
996 void noinline
997 ev_feed_event (EV_P_ void *w, int revents)
998 {
999 W w_ = (W)w;
1000 int pri = ABSPRI (w_);
1001
1002 if (expect_false (w_->pending))
1003 pendings [pri][w_->pending - 1].events |= revents;
1004 else
1005 {
1006 w_->pending = ++pendingcnt [pri];
1007 array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
1008 pendings [pri][w_->pending - 1].w = w_;
1009 pendings [pri][w_->pending - 1].events = revents;
1010 }
1011 }
1012
1013 inline_speed void
1014 feed_reverse (EV_P_ W w)
1015 {
1016 array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
1017 rfeeds [rfeedcnt++] = w;
1018 }
1019
1020 inline_size void
1021 feed_reverse_done (EV_P_ int revents)
1022 {
1023 do
1024 ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
1025 while (rfeedcnt);
1026 }
1027
1028 inline_speed void
1029 queue_events (EV_P_ W *events, int eventcnt, int type)
1030 {
1031 int i;
1032
1033 for (i = 0; i < eventcnt; ++i)
1034 ev_feed_event (EV_A_ events [i], type);
1035 }
1036
1037 /*****************************************************************************/
1038
1039 inline_speed void
1040 fd_event_nocheck (EV_P_ int fd, int revents)
1041 {
1042 ANFD *anfd = anfds + fd;
1043 ev_io *w;
1044
1045 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1046 {
1047 int ev = w->events & revents;
1048
1049 if (ev)
1050 ev_feed_event (EV_A_ (W)w, ev);
1051 }
1052 }
1053
1054 /* do not submit kernel events for fds that have reify set */
1055 /* because that means they changed while we were polling for new events */
1056 inline_speed void
1057 fd_event (EV_P_ int fd, int revents)
1058 {
1059 ANFD *anfd = anfds + fd;
1060
1061 if (expect_true (!anfd->reify))
1062 fd_event_nocheck (EV_A_ fd, revents);
1063 }
1064
1065 void
1066 ev_feed_fd_event (EV_P_ int fd, int revents)
1067 {
1068 if (fd >= 0 && fd < anfdmax)
1069 fd_event_nocheck (EV_A_ fd, revents);
1070 }
1071
1072 /* make sure the external fd watch events are in-sync */
1073 /* with the kernel/libev internal state */
1074 inline_size void
1075 fd_reify (EV_P)
1076 {
1077 int i;
1078
1079 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
1080 for (i = 0; i < fdchangecnt; ++i)
1081 {
1082 int fd = fdchanges [i];
1083 ANFD *anfd = anfds + fd;
1084
1085 if (anfd->reify & EV__IOFDSET && anfd->head)
1086 {
1087 SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
1088
1089 if (handle != anfd->handle)
1090 {
1091 unsigned long arg;
1092
1093 assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
1094
1095 /* handle changed, but fd didn't - we need to do it in two steps */
1096 backend_modify (EV_A_ fd, anfd->events, 0);
1097 anfd->events = 0;
1098 anfd->handle = handle;
1099 }
1100 }
1101 }
1102 #endif
1103
1104 for (i = 0; i < fdchangecnt; ++i)
1105 {
1106 int fd = fdchanges [i];
1107 ANFD *anfd = anfds + fd;
1108 ev_io *w;
1109
1110 unsigned char o_events = anfd->events;
1111 unsigned char o_reify = anfd->reify;
1112
1113 anfd->reify = 0;
1114
1115 /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
1116 {
1117 anfd->events = 0;
1118
1119 for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
1120 anfd->events |= (unsigned char)w->events;
1121
1122 if (o_events != anfd->events)
1123 o_reify = EV__IOFDSET; /* actually |= */
1124 }
1125
1126 if (o_reify & EV__IOFDSET)
1127 backend_modify (EV_A_ fd, o_events, anfd->events);
1128 }
1129
1130 fdchangecnt = 0;
1131 }
1132
1133 /* something about the given fd changed */
1134 inline_size void
1135 fd_change (EV_P_ int fd, int flags)
1136 {
1137 unsigned char reify = anfds [fd].reify;
1138 anfds [fd].reify |= flags;
1139
1140 if (expect_true (!reify))
1141 {
1142 ++fdchangecnt;
1143 array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
1144 fdchanges [fdchangecnt - 1] = fd;
1145 }
1146 }
1147
1148 /* the given fd is invalid/unusable, so make sure it doesn't hurt us anymore */
1149 inline_speed void ecb_cold
1150 fd_kill (EV_P_ int fd)
1151 {
1152 ev_io *w;
1153
1154 while ((w = (ev_io *)anfds [fd].head))
1155 {
1156 ev_io_stop (EV_A_ w);
1157 ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
1158 }
1159 }
1160
1161 /* check whether the given fd is actually valid, for error recovery */
1162 inline_size int ecb_cold
1163 fd_valid (int fd)
1164 {
1165 #ifdef _WIN32
1166 return EV_FD_TO_WIN32_HANDLE (fd) != -1;
1167 #else
1168 return fcntl (fd, F_GETFD) != -1;
1169 #endif
1170 }
1171
1172 /* called on EBADF to verify fds */
1173 static void noinline ecb_cold
1174 fd_ebadf (EV_P)
1175 {
1176 int fd;
1177
1178 for (fd = 0; fd < anfdmax; ++fd)
1179 if (anfds [fd].events)
1180 if (!fd_valid (fd) && errno == EBADF)
1181 fd_kill (EV_A_ fd);
1182 }
1183
1184 /* called on ENOMEM in select/poll to kill some fds and retry */
1185 static void noinline ecb_cold
1186 fd_enomem (EV_P)
1187 {
1188 int fd;
1189
1190 for (fd = anfdmax; fd--; )
1191 if (anfds [fd].events)
1192 {
1193 fd_kill (EV_A_ fd);
1194 break;
1195 }
1196 }
1197
1198 /* usually called after fork if backend needs to re-arm all fds from scratch */
1199 static void noinline
1200 fd_rearm_all (EV_P)
1201 {
1202 int fd;
1203
1204 for (fd = 0; fd < anfdmax; ++fd)
1205 if (anfds [fd].events)
1206 {
1207 anfds [fd].events = 0;
1208 anfds [fd].emask = 0;
1209 fd_change (EV_A_ fd, EV__IOFDSET | EV_ANFD_REIFY);
1210 }
1211 }
1212
1213 /* used to prepare libev internal fd's */
1214 /* this is not fork-safe */
1215 inline_speed void
1216 fd_intern (int fd)
1217 {
1218 #ifdef _WIN32
1219 unsigned long arg = 1;
1220 ioctlsocket (EV_FD_TO_WIN32_HANDLE (fd), FIONBIO, &arg);
1221 #else
1222 fcntl (fd, F_SETFD, FD_CLOEXEC);
1223 fcntl (fd, F_SETFL, O_NONBLOCK);
1224 #endif
1225 }
1226
1227 /*****************************************************************************/
1228
1229 /*
1230 * the heap functions want a real array index. array index 0 is guaranteed to not
1231 * be in-use at any time. the first heap entry is at array [HEAP0]. DHEAP gives
1232 * the branching factor of the d-tree.
1233 */
1234
1235 /*
1236 * at the moment we allow libev the luxury of two heaps,
1237 * a small-code-size 2-heap one and a ~1.5kb larger 4-heap
1238 * which is more cache-efficient.
1239 * the difference is about 5% with 50000+ watchers.
1240 */
1241 #if EV_USE_4HEAP
1242
1243 #define DHEAP 4
1244 #define HEAP0 (DHEAP - 1) /* index of first element in heap */
1245 #define HPARENT(k) ((((k) - HEAP0 - 1) / DHEAP) + HEAP0)
1246 #define UPHEAP_DONE(p,k) ((p) == (k))
1247
1248 /* away from the root */
1249 inline_speed void
1250 downheap (ANHE *heap, int N, int k)
1251 {
1252 ANHE he = heap [k];
1253 ANHE *E = heap + N + HEAP0;
1254
1255 for (;;)
1256 {
1257 ev_tstamp minat;
1258 ANHE *minpos;
1259 ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
1260
1261 /* find minimum child */
1262 if (expect_true (pos + DHEAP - 1 < E))
1263 {
1264 /* fast path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1265 if ( ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1266 if ( ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1267 if ( ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1268 }
1269 else if (pos < E)
1270 {
1271 /* slow path */ (minpos = pos + 0), (minat = ANHE_at (*minpos));
1272 if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
1273 if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
1274 if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
1275 }
1276 else
1277 break;
1278
1279 if (ANHE_at (he) <= minat)
1280 break;
1281
1282 heap [k] = *minpos;
1283 ev_active (ANHE_w (*minpos)) = k;
1284
1285 k = minpos - heap;
1286 }
1287
1288 heap [k] = he;
1289 ev_active (ANHE_w (he)) = k;
1290 }
1291
1292 #else /* 4HEAP */
1293
1294 #define HEAP0 1
1295 #define HPARENT(k) ((k) >> 1)
1296 #define UPHEAP_DONE(p,k) (!(p))
1297
1298 /* away from the root */
1299 inline_speed void
1300 downheap (ANHE *heap, int N, int k)
1301 {
1302 ANHE he = heap [k];
1303
1304 for (;;)
1305 {
1306 int c = k << 1;
1307
1308 if (c >= N + HEAP0)
1309 break;
1310
1311 c += c + 1 < N + HEAP0 && ANHE_at (heap [c]) > ANHE_at (heap [c + 1])
1312 ? 1 : 0;
1313
1314 if (ANHE_at (he) <= ANHE_at (heap [c]))
1315 break;
1316
1317 heap [k] = heap [c];
1318 ev_active (ANHE_w (heap [k])) = k;
1319
1320 k = c;
1321 }
1322
1323 heap [k] = he;
1324 ev_active (ANHE_w (he)) = k;
1325 }
1326 #endif
1327
1328 /* towards the root */
1329 inline_speed void
1330 upheap (ANHE *heap, int k)
1331 {
1332 ANHE he = heap [k];
1333
1334 for (;;)
1335 {
1336 int p = HPARENT (k);
1337
1338 if (UPHEAP_DONE (p, k) || ANHE_at (heap [p]) <= ANHE_at (he))
1339 break;
1340
1341 heap [k] = heap [p];
1342 ev_active (ANHE_w (heap [k])) = k;
1343 k = p;
1344 }
1345
1346 heap [k] = he;
1347 ev_active (ANHE_w (he)) = k;
1348 }
1349
1350 /* move an element suitably so it is in a correct place */
1351 inline_size void
1352 adjustheap (ANHE *heap, int N, int k)
1353 {
1354 if (k > HEAP0 && ANHE_at (heap [k]) <= ANHE_at (heap [HPARENT (k)]))
1355 upheap (heap, k);
1356 else
1357 downheap (heap, N, k);
1358 }
1359
1360 /* rebuild the heap: this function is used only once and executed rarely */
1361 inline_size void
1362 reheap (ANHE *heap, int N)
1363 {
1364 int i;
1365
1366 /* we don't use floyds algorithm, upheap is simpler and is more cache-efficient */
1367 /* also, this is easy to implement and correct for both 2-heaps and 4-heaps */
1368 for (i = 0; i < N; ++i)
1369 upheap (heap, i + HEAP0);
1370 }
1371
1372 /*****************************************************************************/
1373
1374 /* associate signal watchers to a signal signal */
1375 typedef struct
1376 {
1377 EV_ATOMIC_T pending;
1378 #if EV_MULTIPLICITY
1379 EV_P;
1380 #endif
1381 WL head;
1382 } ANSIG;
1383
1384 static ANSIG signals [EV_NSIG - 1];
1385
1386 /*****************************************************************************/
1387
1388 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1389
1390 static void noinline ecb_cold
1391 evpipe_init (EV_P)
1392 {
1393 if (!ev_is_active (&pipe_w))
1394 {
1395 # if EV_USE_EVENTFD
1396 evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
1397 if (evfd < 0 && errno == EINVAL)
1398 evfd = eventfd (0, 0);
1399
1400 if (evfd >= 0)
1401 {
1402 evpipe [0] = -1;
1403 fd_intern (evfd); /* doing it twice doesn't hurt */
1404 ev_io_set (&pipe_w, evfd, EV_READ);
1405 }
1406 else
1407 # endif
1408 {
1409 while (pipe (evpipe))
1410 ev_syserr ("(libev) error creating signal/async pipe");
1411
1412 fd_intern (evpipe [0]);
1413 fd_intern (evpipe [1]);
1414 ev_io_set (&pipe_w, evpipe [0], EV_READ);
1415 }
1416
1417 ev_io_start (EV_A_ &pipe_w);
1418 ev_unref (EV_A); /* watcher should not keep loop alive */
1419 }
1420 }
1421
1422 inline_speed void
1423 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
1424 {
1425 if (!*flag)
1426 {
1427 *flag = 1;
1428
1429 pipe_write_skipped = 1;
1430
1431 if (pipe_write_wanted)
1432 {
1433 int old_errno;
1434
1435 pipe_write_skipped = 0;
1436
1437 old_errno = errno; /* save errno because write will clobber it */
1438
1439 #if EV_USE_EVENTFD
1440 if (evfd >= 0)
1441 {
1442 uint64_t counter = 1;
1443 write (evfd, &counter, sizeof (uint64_t));
1444 }
1445 else
1446 #endif
1447 {
1448 /* win32 people keep sending patches that change this write() to send() */
1449 /* and then run away. but send() is wrong, it wants a socket handle on win32 */
1450 /* so when you think this write should be a send instead, please find out */
1451 /* where your send() is from - it's definitely not the microsoft send, and */
1452 /* tell me. thank you. */
1453 write (evpipe [1], &(evpipe [1]), 1);
1454 }
1455
1456 errno = old_errno;
1457 }
1458 }
1459 }
1460
1461 /* called whenever the libev signal pipe */
1462 /* got some events (signal, async) */
1463 static void
1464 pipecb (EV_P_ ev_io *iow, int revents)
1465 {
1466 int i;
1467
1468 if (revents & EV_READ)
1469 {
1470 #if EV_USE_EVENTFD
1471 if (evfd >= 0)
1472 {
1473 uint64_t counter;
1474 read (evfd, &counter, sizeof (uint64_t));
1475 }
1476 else
1477 #endif
1478 {
1479 char dummy;
1480 /* see discussion in evpipe_write when you think this read should be recv in win32 */
1481 read (evpipe [0], &dummy, 1);
1482 }
1483 }
1484
1485 pipe_write_skipped = 0;
1486
1487 #if EV_SIGNAL_ENABLE
1488 if (sig_pending)
1489 {
1490 sig_pending = 0;
1491
1492 for (i = EV_NSIG - 1; i--; )
1493 if (expect_false (signals [i].pending))
1494 ev_feed_signal_event (EV_A_ i + 1);
1495 }
1496 #endif
1497
1498 #if EV_ASYNC_ENABLE
1499 if (async_pending)
1500 {
1501 async_pending = 0;
1502
1503 for (i = asynccnt; i--; )
1504 if (asyncs [i]->sent)
1505 {
1506 asyncs [i]->sent = 0;
1507 ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
1508 }
1509 }
1510 #endif
1511 }
1512
1513 /*****************************************************************************/
1514
1515 void
1516 ev_feed_signal (int signum)
1517 {
1518 #if EV_MULTIPLICITY
1519 EV_P = signals [signum - 1].loop;
1520
1521 if (!EV_A)
1522 return;
1523 #endif
1524
1525 if (!ev_active (&pipe_w))
1526 return;
1527
1528 signals [signum - 1].pending = 1;
1529 evpipe_write (EV_A_ &sig_pending);
1530 }
1531
1532 static void
1533 ev_sighandler (int signum)
1534 {
1535 #ifdef _WIN32
1536 signal (signum, ev_sighandler);
1537 #endif
1538
1539 ev_feed_signal (signum);
1540 }
1541
1542 void noinline
1543 ev_feed_signal_event (EV_P_ int signum)
1544 {
1545 WL w;
1546
1547 if (expect_false (signum <= 0 || signum > EV_NSIG))
1548 return;
1549
1550 --signum;
1551
1552 #if EV_MULTIPLICITY
1553 /* it is permissible to try to feed a signal to the wrong loop */
1554 /* or, likely more useful, feeding a signal nobody is waiting for */
1555
1556 if (expect_false (signals [signum].loop != EV_A))
1557 return;
1558 #endif
1559
1560 signals [signum].pending = 0;
1561
1562 for (w = signals [signum].head; w; w = w->next)
1563 ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
1564 }
1565
1566 #if EV_USE_SIGNALFD
1567 static void
1568 sigfdcb (EV_P_ ev_io *iow, int revents)
1569 {
1570 struct signalfd_siginfo si[2], *sip; /* these structs are big */
1571
1572 for (;;)
1573 {
1574 ssize_t res = read (sigfd, si, sizeof (si));
1575
1576 /* not ISO-C, as res might be -1, but works with SuS */
1577 for (sip = si; (char *)sip < (char *)si + res; ++sip)
1578 ev_feed_signal_event (EV_A_ sip->ssi_signo);
1579
1580 if (res < (ssize_t)sizeof (si))
1581 break;
1582 }
1583 }
1584 #endif
1585
1586 #endif
1587
1588 /*****************************************************************************/
1589
1590 #if EV_CHILD_ENABLE
1591 static WL childs [EV_PID_HASHSIZE];
1592
1593 static ev_signal childev;
1594
1595 #ifndef WIFCONTINUED
1596 # define WIFCONTINUED(status) 0
1597 #endif
1598
1599 /* handle a single child status event */
1600 inline_speed void
1601 child_reap (EV_P_ int chain, int pid, int status)
1602 {
1603 ev_child *w;
1604 int traced = WIFSTOPPED (status) || WIFCONTINUED (status);
1605
1606 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
1607 {
1608 if ((w->pid == pid || !w->pid)
1609 && (!traced || (w->flags & 1)))
1610 {
1611 ev_set_priority (w, EV_MAXPRI); /* need to do it *now*, this *must* be the same prio as the signal watcher itself */
1612 w->rpid = pid;
1613 w->rstatus = status;
1614 ev_feed_event (EV_A_ (W)w, EV_CHILD);
1615 }
1616 }
1617 }
1618
1619 #ifndef WCONTINUED
1620 # define WCONTINUED 0
1621 #endif
1622
1623 /* called on sigchld etc., calls waitpid */
1624 static void
1625 childcb (EV_P_ ev_signal *sw, int revents)
1626 {
1627 int pid, status;
1628
1629 /* some systems define WCONTINUED but then fail to support it (linux 2.4) */
1630 if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
1631 if (!WCONTINUED
1632 || errno != EINVAL
1633 || 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
1634 return;
1635
1636 /* make sure we are called again until all children have been reaped */
1637 /* we need to do it this way so that the callback gets called before we continue */
1638 ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
1639
1640 child_reap (EV_A_ pid, pid, status);
1641 if ((EV_PID_HASHSIZE) > 1)
1642 child_reap (EV_A_ 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
1643 }
1644
1645 #endif
1646
1647 /*****************************************************************************/
1648
1649 #if EV_USE_IOCP
1650 # include "ev_iocp.c"
1651 #endif
1652 #if EV_USE_PORT
1653 # include "ev_port.c"
1654 #endif
1655 #if EV_USE_KQUEUE
1656 # include "ev_kqueue.c"
1657 #endif
1658 #if EV_USE_EPOLL
1659 # include "ev_epoll.c"
1660 #endif
1661 #if EV_USE_POLL
1662 # include "ev_poll.c"
1663 #endif
1664 #if EV_USE_SELECT
1665 # include "ev_select.c"
1666 #endif
1667
1668 int ecb_cold
1669 ev_version_major (void)
1670 {
1671 return EV_VERSION_MAJOR;
1672 }
1673
1674 int ecb_cold
1675 ev_version_minor (void)
1676 {
1677 return EV_VERSION_MINOR;
1678 }
1679
1680 /* return true if we are running with elevated privileges and should ignore env variables */
1681 int inline_size ecb_cold
1682 enable_secure (void)
1683 {
1684 #ifdef _WIN32
1685 return 0;
1686 #else
1687 return getuid () != geteuid ()
1688 || getgid () != getegid ();
1689 #endif
1690 }
1691
1692 unsigned int ecb_cold
1693 ev_supported_backends (void)
1694 {
1695 unsigned int flags = 0;
1696
1697 if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
1698 if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
1699 if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
1700 if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
1701 if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
1702
1703 return flags;
1704 }
1705
1706 unsigned int ecb_cold
1707 ev_recommended_backends (void)
1708 {
1709 unsigned int flags = ev_supported_backends ();
1710
1711 #ifndef __NetBSD__
1712 /* kqueue is borked on everything but netbsd apparently */
1713 /* it usually doesn't work correctly on anything but sockets and pipes */
1714 flags &= ~EVBACKEND_KQUEUE;
1715 #endif
1716 #ifdef __APPLE__
1717 /* only select works correctly on that "unix-certified" platform */
1718 flags &= ~EVBACKEND_KQUEUE; /* horribly broken, even for sockets */
1719 flags &= ~EVBACKEND_POLL; /* poll is based on kqueue from 10.5 onwards */
1720 #endif
1721 #ifdef __FreeBSD__
1722 flags &= ~EVBACKEND_POLL; /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
1723 #endif
1724
1725 return flags;
1726 }
1727
1728 unsigned int ecb_cold
1729 ev_embeddable_backends (void)
1730 {
1731 int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT;
1732
1733 /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
1734 if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
1735 flags &= ~EVBACKEND_EPOLL;
1736
1737 return flags;
1738 }
1739
1740 unsigned int
1741 ev_backend (EV_P)
1742 {
1743 return backend;
1744 }
1745
1746 #if EV_FEATURE_API
1747 unsigned int
1748 ev_iteration (EV_P)
1749 {
1750 return loop_count;
1751 }
1752
1753 unsigned int
1754 ev_depth (EV_P)
1755 {
1756 return loop_depth;
1757 }
1758
1759 void
1760 ev_set_io_collect_interval (EV_P_ ev_tstamp interval)
1761 {
1762 io_blocktime = interval;
1763 }
1764
1765 void
1766 ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval)
1767 {
1768 timeout_blocktime = interval;
1769 }
1770
1771 void
1772 ev_set_userdata (EV_P_ void *data)
1773 {
1774 userdata = data;
1775 }
1776
1777 void *
1778 ev_userdata (EV_P)
1779 {
1780 return userdata;
1781 }
1782
1783 void
1784 ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P))
1785 {
1786 invoke_cb = invoke_pending_cb;
1787 }
1788
1789 void
1790 ev_set_loop_release_cb (EV_P_ void (*release)(EV_P), void (*acquire)(EV_P))
1791 {
1792 release_cb = release;
1793 acquire_cb = acquire;
1794 }
1795 #endif
1796
1797 /* initialise a loop structure, must be zero-initialised */
1798 static void noinline ecb_cold
1799 loop_init (EV_P_ unsigned int flags)
1800 {
1801 if (!backend)
1802 {
1803 origflags = flags;
1804
1805 #if EV_USE_REALTIME
1806 if (!have_realtime)
1807 {
1808 struct timespec ts;
1809
1810 if (!clock_gettime (CLOCK_REALTIME, &ts))
1811 have_realtime = 1;
1812 }
1813 #endif
1814
1815 #if EV_USE_MONOTONIC
1816 if (!have_monotonic)
1817 {
1818 struct timespec ts;
1819
1820 if (!clock_gettime (CLOCK_MONOTONIC, &ts))
1821 have_monotonic = 1;
1822 }
1823 #endif
1824
1825 /* pid check not overridable via env */
1826 #ifndef _WIN32
1827 if (flags & EVFLAG_FORKCHECK)
1828 curpid = getpid ();
1829 #endif
1830
1831 if (!(flags & EVFLAG_NOENV)
1832 && !enable_secure ()
1833 && getenv ("LIBEV_FLAGS"))
1834 flags = atoi (getenv ("LIBEV_FLAGS"));
1835
1836 ev_rt_now = ev_time ();
1837 mn_now = get_clock ();
1838 now_floor = mn_now;
1839 rtmn_diff = ev_rt_now - mn_now;
1840 #if EV_FEATURE_API
1841 invoke_cb = ev_invoke_pending;
1842 #endif
1843
1844 io_blocktime = 0.;
1845 timeout_blocktime = 0.;
1846 backend = 0;
1847 backend_fd = -1;
1848 sig_pending = 0;
1849 #if EV_ASYNC_ENABLE
1850 async_pending = 0;
1851 #endif
1852 pipe_write_skipped = 0;
1853 pipe_write_wanted = 0;
1854 #if EV_USE_INOTIFY
1855 fs_fd = flags & EVFLAG_NOINOTIFY ? -1 : -2;
1856 #endif
1857 #if EV_USE_SIGNALFD
1858 sigfd = flags & EVFLAG_SIGNALFD ? -2 : -1;
1859 #endif
1860
1861 if (!(flags & EVBACKEND_MASK))
1862 flags |= ev_recommended_backends ();
1863
1864 #if EV_USE_IOCP
1865 if (!backend && (flags & EVBACKEND_IOCP )) backend = iocp_init (EV_A_ flags);
1866 #endif
1867 #if EV_USE_PORT
1868 if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
1869 #endif
1870 #if EV_USE_KQUEUE
1871 if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
1872 #endif
1873 #if EV_USE_EPOLL
1874 if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
1875 #endif
1876 #if EV_USE_POLL
1877 if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
1878 #endif
1879 #if EV_USE_SELECT
1880 if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
1881 #endif
1882
1883 ev_prepare_init (&pending_w, pendingcb);
1884
1885 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
1886 ev_init (&pipe_w, pipecb);
1887 ev_set_priority (&pipe_w, EV_MAXPRI);
1888 #endif
1889 }
1890 }
1891
1892 /* free up a loop structure */
1893 void ecb_cold
1894 ev_loop_destroy (EV_P)
1895 {
1896 int i;
1897
1898 #if EV_MULTIPLICITY
1899 /* mimic free (0) */
1900 if (!EV_A)
1901 return;
1902 #endif
1903
1904 #if EV_CLEANUP_ENABLE
1905 /* queue cleanup watchers (and execute them) */
1906 if (expect_false (cleanupcnt))
1907 {
1908 queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
1909 EV_INVOKE_PENDING;
1910 }
1911 #endif
1912
1913 #if EV_CHILD_ENABLE
1914 if (ev_is_active (&childev))
1915 {
1916 ev_ref (EV_A); /* child watcher */
1917 ev_signal_stop (EV_A_ &childev);
1918 }
1919 #endif
1920
1921 if (ev_is_active (&pipe_w))
1922 {
1923 /*ev_ref (EV_A);*/
1924 /*ev_io_stop (EV_A_ &pipe_w);*/
1925
1926 #if EV_USE_EVENTFD
1927 if (evfd >= 0)
1928 close (evfd);
1929 #endif
1930
1931 if (evpipe [0] >= 0)
1932 {
1933 EV_WIN32_CLOSE_FD (evpipe [0]);
1934 EV_WIN32_CLOSE_FD (evpipe [1]);
1935 }
1936 }
1937
1938 #if EV_USE_SIGNALFD
1939 if (ev_is_active (&sigfd_w))
1940 close (sigfd);
1941 #endif
1942
1943 #if EV_USE_INOTIFY
1944 if (fs_fd >= 0)
1945 close (fs_fd);
1946 #endif
1947
1948 if (backend_fd >= 0)
1949 close (backend_fd);
1950
1951 #if EV_USE_IOCP
1952 if (backend == EVBACKEND_IOCP ) iocp_destroy (EV_A);
1953 #endif
1954 #if EV_USE_PORT
1955 if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
1956 #endif
1957 #if EV_USE_KQUEUE
1958 if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
1959 #endif
1960 #if EV_USE_EPOLL
1961 if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
1962 #endif
1963 #if EV_USE_POLL
1964 if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
1965 #endif
1966 #if EV_USE_SELECT
1967 if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
1968 #endif
1969
1970 for (i = NUMPRI; i--; )
1971 {
1972 array_free (pending, [i]);
1973 #if EV_IDLE_ENABLE
1974 array_free (idle, [i]);
1975 #endif
1976 }
1977
1978 ev_free (anfds); anfds = 0; anfdmax = 0;
1979
1980 /* have to use the microsoft-never-gets-it-right macro */
1981 array_free (rfeed, EMPTY);
1982 array_free (fdchange, EMPTY);
1983 array_free (timer, EMPTY);
1984 #if EV_PERIODIC_ENABLE
1985 array_free (periodic, EMPTY);
1986 #endif
1987 #if EV_FORK_ENABLE
1988 array_free (fork, EMPTY);
1989 #endif
1990 #if EV_CLEANUP_ENABLE
1991 array_free (cleanup, EMPTY);
1992 #endif
1993 array_free (prepare, EMPTY);
1994 array_free (check, EMPTY);
1995 #if EV_ASYNC_ENABLE
1996 array_free (async, EMPTY);
1997 #endif
1998
1999 backend = 0;
2000
2001 #if EV_MULTIPLICITY
2002 if (ev_is_default_loop (EV_A))
2003 #endif
2004 ev_default_loop_ptr = 0;
2005 #if EV_MULTIPLICITY
2006 else
2007 ev_free (EV_A);
2008 #endif
2009 }
2010
2011 #if EV_USE_INOTIFY
2012 inline_size void infy_fork (EV_P);
2013 #endif
2014
2015 inline_size void
2016 loop_fork (EV_P)
2017 {
2018 #if EV_USE_PORT
2019 if (backend == EVBACKEND_PORT ) port_fork (EV_A);
2020 #endif
2021 #if EV_USE_KQUEUE
2022 if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
2023 #endif
2024 #if EV_USE_EPOLL
2025 if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
2026 #endif
2027 #if EV_USE_INOTIFY
2028 infy_fork (EV_A);
2029 #endif
2030
2031 if (ev_is_active (&pipe_w))
2032 {
2033 /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
2034
2035 ev_ref (EV_A);
2036 ev_io_stop (EV_A_ &pipe_w);
2037
2038 #if EV_USE_EVENTFD
2039 if (evfd >= 0)
2040 close (evfd);
2041 #endif
2042
2043 if (evpipe [0] >= 0)
2044 {
2045 EV_WIN32_CLOSE_FD (evpipe [0]);
2046 EV_WIN32_CLOSE_FD (evpipe [1]);
2047 }
2048
2049 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
2050 evpipe_init (EV_A);
2051 /* now iterate over everything, in case we missed something */
2052 pipecb (EV_A_ &pipe_w, EV_READ);
2053 #endif
2054 }
2055
2056 postfork = 0;
2057 }
2058
2059 #if EV_MULTIPLICITY
2060
2061 struct ev_loop * ecb_cold
2062 ev_loop_new (unsigned int flags)
2063 {
2064 EV_P = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
2065
2066 memset (EV_A, 0, sizeof (struct ev_loop));
2067 loop_init (EV_A_ flags);
2068
2069 if (ev_backend (EV_A))
2070 return EV_A;
2071
2072 ev_free (EV_A);
2073 return 0;
2074 }
2075
2076 #endif /* multiplicity */
2077
2078 #if EV_VERIFY
2079 static void noinline ecb_cold
2080 verify_watcher (EV_P_ W w)
2081 {
2082 assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
2083
2084 if (w->pending)
2085 assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
2086 }
2087
2088 static void noinline ecb_cold
2089 verify_heap (EV_P_ ANHE *heap, int N)
2090 {
2091 int i;
2092
2093 for (i = HEAP0; i < N + HEAP0; ++i)
2094 {
2095 assert (("libev: active index mismatch in heap", ev_active (ANHE_w (heap [i])) == i));
2096 assert (("libev: heap condition violated", i == HEAP0 || ANHE_at (heap [HPARENT (i)]) <= ANHE_at (heap [i])));
2097 assert (("libev: heap at cache mismatch", ANHE_at (heap [i]) == ev_at (ANHE_w (heap [i]))));
2098
2099 verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
2100 }
2101 }
2102
2103 static void noinline ecb_cold
2104 array_verify (EV_P_ W *ws, int cnt)
2105 {
2106 while (cnt--)
2107 {
2108 assert (("libev: active index mismatch", ev_active (ws [cnt]) == cnt + 1));
2109 verify_watcher (EV_A_ ws [cnt]);
2110 }
2111 }
2112 #endif
2113
2114 #if EV_FEATURE_API
2115 void ecb_cold
2116 ev_verify (EV_P)
2117 {
2118 #if EV_VERIFY
2119 int i;
2120 WL w;
2121
2122 assert (activecnt >= -1);
2123
2124 assert (fdchangemax >= fdchangecnt);
2125 for (i = 0; i < fdchangecnt; ++i)
2126 assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
2127
2128 assert (anfdmax >= 0);
2129 for (i = 0; i < anfdmax; ++i)
2130 for (w = anfds [i].head; w; w = w->next)
2131 {
2132 verify_watcher (EV_A_ (W)w);
2133 assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
2134 assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
2135 }
2136
2137 assert (timermax >= timercnt);
2138 verify_heap (EV_A_ timers, timercnt);
2139
2140 #if EV_PERIODIC_ENABLE
2141 assert (periodicmax >= periodiccnt);
2142 verify_heap (EV_A_ periodics, periodiccnt);
2143 #endif
2144
2145 for (i = NUMPRI; i--; )
2146 {
2147 assert (pendingmax [i] >= pendingcnt [i]);
2148 #if EV_IDLE_ENABLE
2149 assert (idleall >= 0);
2150 assert (idlemax [i] >= idlecnt [i]);
2151 array_verify (EV_A_ (W *)idles [i], idlecnt [i]);
2152 #endif
2153 }
2154
2155 #if EV_FORK_ENABLE
2156 assert (forkmax >= forkcnt);
2157 array_verify (EV_A_ (W *)forks, forkcnt);
2158 #endif
2159
2160 #if EV_CLEANUP_ENABLE
2161 assert (cleanupmax >= cleanupcnt);
2162 array_verify (EV_A_ (W *)cleanups, cleanupcnt);
2163 #endif
2164
2165 #if EV_ASYNC_ENABLE
2166 assert (asyncmax >= asynccnt);
2167 array_verify (EV_A_ (W *)asyncs, asynccnt);
2168 #endif
2169
2170 #if EV_PREPARE_ENABLE
2171 assert (preparemax >= preparecnt);
2172 array_verify (EV_A_ (W *)prepares, preparecnt);
2173 #endif
2174
2175 #if EV_CHECK_ENABLE
2176 assert (checkmax >= checkcnt);
2177 array_verify (EV_A_ (W *)checks, checkcnt);
2178 #endif
2179
2180 # if 0
2181 #if EV_CHILD_ENABLE
2182 for (w = (ev_child *)childs [chain & ((EV_PID_HASHSIZE) - 1)]; w; w = (ev_child *)((WL)w)->next)
2183 for (signum = EV_NSIG; signum--; ) if (signals [signum].pending)
2184 #endif
2185 # endif
2186 #endif
2187 }
2188 #endif
2189
2190 #if EV_MULTIPLICITY
2191 struct ev_loop * ecb_cold
2192 #else
2193 int
2194 #endif
2195 ev_default_loop (unsigned int flags)
2196 {
2197 if (!ev_default_loop_ptr)
2198 {
2199 #if EV_MULTIPLICITY
2200 EV_P = ev_default_loop_ptr = &default_loop_struct;
2201 #else
2202 ev_default_loop_ptr = 1;
2203 #endif
2204
2205 loop_init (EV_A_ flags);
2206
2207 if (ev_backend (EV_A))
2208 {
2209 #if EV_CHILD_ENABLE
2210 ev_signal_init (&childev, childcb, SIGCHLD);
2211 ev_set_priority (&childev, EV_MAXPRI);
2212 ev_signal_start (EV_A_ &childev);
2213 ev_unref (EV_A); /* child watcher should not keep loop alive */
2214 #endif
2215 }
2216 else
2217 ev_default_loop_ptr = 0;
2218 }
2219
2220 return ev_default_loop_ptr;
2221 }
2222
2223 void
2224 ev_loop_fork (EV_P)
2225 {
2226 postfork = 1; /* must be in line with ev_default_fork */
2227 }
2228
2229 /*****************************************************************************/
2230
2231 void
2232 ev_invoke (EV_P_ void *w, int revents)
2233 {
2234 EV_CB_INVOKE ((W)w, revents);
2235 }
2236
2237 unsigned int
2238 ev_pending_count (EV_P)
2239 {
2240 int pri;
2241 unsigned int count = 0;
2242
2243 for (pri = NUMPRI; pri--; )
2244 count += pendingcnt [pri];
2245
2246 return count;
2247 }
2248
2249 void noinline
2250 ev_invoke_pending (EV_P)
2251 {
2252 int pri;
2253
2254 for (pri = NUMPRI; pri--; )
2255 while (pendingcnt [pri])
2256 {
2257 ANPENDING *p = pendings [pri] + --pendingcnt [pri];
2258
2259 p->w->pending = 0;
2260 EV_CB_INVOKE (p->w, p->events);
2261 EV_FREQUENT_CHECK;
2262 }
2263 }
2264
2265 #if EV_IDLE_ENABLE
2266 /* make idle watchers pending. this handles the "call-idle */
2267 /* only when higher priorities are idle" logic */
2268 inline_size void
2269 idle_reify (EV_P)
2270 {
2271 if (expect_false (idleall))
2272 {
2273 int pri;
2274
2275 for (pri = NUMPRI; pri--; )
2276 {
2277 if (pendingcnt [pri])
2278 break;
2279
2280 if (idlecnt [pri])
2281 {
2282 queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
2283 break;
2284 }
2285 }
2286 }
2287 }
2288 #endif
2289
2290 /* make timers pending */
2291 inline_size void
2292 timers_reify (EV_P)
2293 {
2294 EV_FREQUENT_CHECK;
2295
2296 if (timercnt && ANHE_at (timers [HEAP0]) < mn_now)
2297 {
2298 do
2299 {
2300 ev_timer *w = (ev_timer *)ANHE_w (timers [HEAP0]);
2301
2302 /*assert (("libev: inactive timer on timer heap detected", ev_is_active (w)));*/
2303
2304 /* first reschedule or stop timer */
2305 if (w->repeat)
2306 {
2307 ev_at (w) += w->repeat;
2308 if (ev_at (w) < mn_now)
2309 ev_at (w) = mn_now;
2310
2311 assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
2312
2313 ANHE_at_cache (timers [HEAP0]);
2314 downheap (timers, timercnt, HEAP0);
2315 }
2316 else
2317 ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
2318
2319 EV_FREQUENT_CHECK;
2320 feed_reverse (EV_A_ (W)w);
2321 }
2322 while (timercnt && ANHE_at (timers [HEAP0]) < mn_now);
2323
2324 feed_reverse_done (EV_A_ EV_TIMER);
2325 }
2326 }
2327
2328 #if EV_PERIODIC_ENABLE
2329
2330 static void noinline
2331 periodic_recalc (EV_P_ ev_periodic *w)
2332 {
2333 ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
2334 ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
2335
2336 /* the above almost always errs on the low side */
2337 while (at <= ev_rt_now)
2338 {
2339 ev_tstamp nat = at + w->interval;
2340
2341 /* when resolution fails us, we use ev_rt_now */
2342 if (expect_false (nat == at))
2343 {
2344 at = ev_rt_now;
2345 break;
2346 }
2347
2348 at = nat;
2349 }
2350
2351 ev_at (w) = at;
2352 }
2353
2354 /* make periodics pending */
2355 inline_size void
2356 periodics_reify (EV_P)
2357 {
2358 EV_FREQUENT_CHECK;
2359
2360 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
2361 {
2362 int feed_count = 0;
2363
2364 do
2365 {
2366 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
2367
2368 /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
2369
2370 /* first reschedule or stop timer */
2371 if (w->reschedule_cb)
2372 {
2373 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2374
2375 assert (("libev: ev_periodic reschedule callback returned time in the past", ev_at (w) >= ev_rt_now));
2376
2377 ANHE_at_cache (periodics [HEAP0]);
2378 downheap (periodics, periodiccnt, HEAP0);
2379 }
2380 else if (w->interval)
2381 {
2382 periodic_recalc (EV_A_ w);
2383 ANHE_at_cache (periodics [HEAP0]);
2384 downheap (periodics, periodiccnt, HEAP0);
2385 }
2386 else
2387 ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
2388
2389 EV_FREQUENT_CHECK;
2390 feed_reverse (EV_A_ (W)w);
2391 }
2392 while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now);
2393
2394 feed_reverse_done (EV_A_ EV_PERIODIC);
2395 }
2396 }
2397
2398 /* simply recalculate all periodics */
2399 /* TODO: maybe ensure that at least one event happens when jumping forward? */
2400 static void noinline ecb_cold
2401 periodics_reschedule (EV_P)
2402 {
2403 int i;
2404
2405 /* adjust periodics after time jump */
2406 for (i = HEAP0; i < periodiccnt + HEAP0; ++i)
2407 {
2408 ev_periodic *w = (ev_periodic *)ANHE_w (periodics [i]);
2409
2410 if (w->reschedule_cb)
2411 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2412 else if (w->interval)
2413 periodic_recalc (EV_A_ w);
2414
2415 ANHE_at_cache (periodics [i]);
2416 }
2417
2418 reheap (periodics, periodiccnt);
2419 }
2420 #endif
2421
2422 /* adjust all timers by a given offset */
2423 static void noinline ecb_cold
2424 timers_reschedule (EV_P_ ev_tstamp adjust)
2425 {
2426 int i;
2427
2428 for (i = 0; i < timercnt; ++i)
2429 {
2430 ANHE *he = timers + i + HEAP0;
2431 ANHE_w (*he)->at += adjust;
2432 ANHE_at_cache (*he);
2433 }
2434 }
2435
2436 /* fetch new monotonic and realtime times from the kernel */
2437 /* also detect if there was a timejump, and act accordingly */
2438 inline_speed void
2439 time_update (EV_P_ ev_tstamp max_block)
2440 {
2441 #if EV_USE_MONOTONIC
2442 if (expect_true (have_monotonic))
2443 {
2444 int i;
2445 ev_tstamp odiff = rtmn_diff;
2446
2447 mn_now = get_clock ();
2448
2449 /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
2450 /* interpolate in the meantime */
2451 if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
2452 {
2453 ev_rt_now = rtmn_diff + mn_now;
2454 return;
2455 }
2456
2457 now_floor = mn_now;
2458 ev_rt_now = ev_time ();
2459
2460 /* loop a few times, before making important decisions.
2461 * on the choice of "4": one iteration isn't enough,
2462 * in case we get preempted during the calls to
2463 * ev_time and get_clock. a second call is almost guaranteed
2464 * to succeed in that case, though. and looping a few more times
2465 * doesn't hurt either as we only do this on time-jumps or
2466 * in the unlikely event of having been preempted here.
2467 */
2468 for (i = 4; --i; )
2469 {
2470 ev_tstamp diff;
2471 rtmn_diff = ev_rt_now - mn_now;
2472
2473 diff = odiff - rtmn_diff;
2474
2475 if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
2476 return; /* all is well */
2477
2478 ev_rt_now = ev_time ();
2479 mn_now = get_clock ();
2480 now_floor = mn_now;
2481 }
2482
2483 /* no timer adjustment, as the monotonic clock doesn't jump */
2484 /* timers_reschedule (EV_A_ rtmn_diff - odiff) */
2485 # if EV_PERIODIC_ENABLE
2486 periodics_reschedule (EV_A);
2487 # endif
2488 }
2489 else
2490 #endif
2491 {
2492 ev_rt_now = ev_time ();
2493
2494 if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
2495 {
2496 /* adjust timers. this is easy, as the offset is the same for all of them */
2497 timers_reschedule (EV_A_ ev_rt_now - mn_now);
2498 #if EV_PERIODIC_ENABLE
2499 periodics_reschedule (EV_A);
2500 #endif
2501 }
2502
2503 mn_now = ev_rt_now;
2504 }
2505 }
2506
2507 void
2508 ev_run (EV_P_ int flags)
2509 {
2510 #if EV_FEATURE_API
2511 ++loop_depth;
2512 #endif
2513
2514 assert (("libev: ev_loop recursion during release detected", loop_done != EVBREAK_RECURSE));
2515
2516 loop_done = EVBREAK_CANCEL;
2517
2518 EV_INVOKE_PENDING; /* in case we recurse, ensure ordering stays nice and clean */
2519
2520 do
2521 {
2522 #if EV_VERIFY >= 2
2523 ev_verify (EV_A);
2524 #endif
2525
2526 #ifndef _WIN32
2527 if (expect_false (curpid)) /* penalise the forking check even more */
2528 if (expect_false (getpid () != curpid))
2529 {
2530 curpid = getpid ();
2531 postfork = 1;
2532 }
2533 #endif
2534
2535 #if EV_FORK_ENABLE
2536 /* we might have forked, so queue fork handlers */
2537 if (expect_false (postfork))
2538 if (forkcnt)
2539 {
2540 queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
2541 EV_INVOKE_PENDING;
2542 }
2543 #endif
2544
2545 #if EV_PREPARE_ENABLE
2546 /* queue prepare watchers (and execute them) */
2547 if (expect_false (preparecnt))
2548 {
2549 queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
2550 EV_INVOKE_PENDING;
2551 }
2552 #endif
2553
2554 if (expect_false (loop_done))
2555 break;
2556
2557 /* we might have forked, so reify kernel state if necessary */
2558 if (expect_false (postfork))
2559 loop_fork (EV_A);
2560
2561 /* update fd-related kernel structures */
2562 fd_reify (EV_A);
2563
2564 /* calculate blocking time */
2565 {
2566 ev_tstamp waittime = 0.;
2567 ev_tstamp sleeptime = 0.;
2568
2569 /* remember old timestamp for io_blocktime calculation */
2570 ev_tstamp prev_mn_now = mn_now;
2571
2572 /* update time to cancel out callback processing overhead */
2573 time_update (EV_A_ 1e100);
2574
2575 /* from now on, we want a pipe-wake-up */
2576 pipe_write_wanted = 1;
2577
2578 if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
2579 {
2580 waittime = MAX_BLOCKTIME;
2581
2582 if (timercnt)
2583 {
2584 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
2585 if (waittime > to) waittime = to;
2586 }
2587
2588 #if EV_PERIODIC_ENABLE
2589 if (periodiccnt)
2590 {
2591 ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now;
2592 if (waittime > to) waittime = to;
2593 }
2594 #endif
2595
2596 /* don't let timeouts decrease the waittime below timeout_blocktime */
2597 if (expect_false (waittime < timeout_blocktime))
2598 waittime = timeout_blocktime;
2599
2600 /* at this point, we NEED to wait, so we have to ensure */
2601 /* to pass a minimum nonzero value to the backend */
2602 if (expect_false (waittime < backend_mintime))
2603 waittime = backend_mintime;
2604
2605 /* extra check because io_blocktime is commonly 0 */
2606 if (expect_false (io_blocktime))
2607 {
2608 sleeptime = io_blocktime - (mn_now - prev_mn_now);
2609
2610 if (sleeptime > waittime - backend_mintime)
2611 sleeptime = waittime - backend_mintime;
2612
2613 if (expect_true (sleeptime > 0.))
2614 {
2615 ev_sleep (sleeptime);
2616 waittime -= sleeptime;
2617 }
2618 }
2619 }
2620
2621 #if EV_FEATURE_API
2622 ++loop_count;
2623 #endif
2624 assert ((loop_done = EVBREAK_RECURSE, 1)); /* assert for side effect */
2625 backend_poll (EV_A_ waittime);
2626 assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
2627
2628 pipe_write_wanted = 0;
2629
2630 if (pipe_write_skipped)
2631 {
2632 assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
2633 ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
2634 }
2635
2636
2637 /* update ev_rt_now, do magic */
2638 time_update (EV_A_ waittime + sleeptime);
2639 }
2640
2641 /* queue pending timers and reschedule them */
2642 timers_reify (EV_A); /* relative timers called last */
2643 #if EV_PERIODIC_ENABLE
2644 periodics_reify (EV_A); /* absolute timers called first */
2645 #endif
2646
2647 #if EV_IDLE_ENABLE
2648 /* queue idle watchers unless other events are pending */
2649 idle_reify (EV_A);
2650 #endif
2651
2652 #if EV_CHECK_ENABLE
2653 /* queue check watchers, to be executed first */
2654 if (expect_false (checkcnt))
2655 queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
2656 #endif
2657
2658 EV_INVOKE_PENDING;
2659 }
2660 while (expect_true (
2661 activecnt
2662 && !loop_done
2663 && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
2664 ));
2665
2666 if (loop_done == EVBREAK_ONE)
2667 loop_done = EVBREAK_CANCEL;
2668
2669 #if EV_FEATURE_API
2670 --loop_depth;
2671 #endif
2672 }
2673
2674 void
2675 ev_break (EV_P_ int how)
2676 {
2677 loop_done = how;
2678 }
2679
2680 void
2681 ev_ref (EV_P)
2682 {
2683 ++activecnt;
2684 }
2685
2686 void
2687 ev_unref (EV_P)
2688 {
2689 --activecnt;
2690 }
2691
2692 void
2693 ev_now_update (EV_P)
2694 {
2695 time_update (EV_A_ 1e100);
2696 }
2697
2698 void
2699 ev_suspend (EV_P)
2700 {
2701 ev_now_update (EV_A);
2702 }
2703
2704 void
2705 ev_resume (EV_P)
2706 {
2707 ev_tstamp mn_prev = mn_now;
2708
2709 ev_now_update (EV_A);
2710 timers_reschedule (EV_A_ mn_now - mn_prev);
2711 #if EV_PERIODIC_ENABLE
2712 /* TODO: really do this? */
2713 periodics_reschedule (EV_A);
2714 #endif
2715 }
2716
2717 /*****************************************************************************/
2718 /* singly-linked list management, used when the expected list length is short */
2719
2720 inline_size void
2721 wlist_add (WL *head, WL elem)
2722 {
2723 elem->next = *head;
2724 *head = elem;
2725 }
2726
2727 inline_size void
2728 wlist_del (WL *head, WL elem)
2729 {
2730 while (*head)
2731 {
2732 if (expect_true (*head == elem))
2733 {
2734 *head = elem->next;
2735 break;
2736 }
2737
2738 head = &(*head)->next;
2739 }
2740 }
2741
2742 /* internal, faster, version of ev_clear_pending */
2743 inline_speed void
2744 clear_pending (EV_P_ W w)
2745 {
2746 if (w->pending)
2747 {
2748 pendings [ABSPRI (w)][w->pending - 1].w = (W)&pending_w;
2749 w->pending = 0;
2750 }
2751 }
2752
2753 int
2754 ev_clear_pending (EV_P_ void *w)
2755 {
2756 W w_ = (W)w;
2757 int pending = w_->pending;
2758
2759 if (expect_true (pending))
2760 {
2761 ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
2762 p->w = (W)&pending_w;
2763 w_->pending = 0;
2764 return p->events;
2765 }
2766 else
2767 return 0;
2768 }
2769
2770 inline_size void
2771 pri_adjust (EV_P_ W w)
2772 {
2773 int pri = ev_priority (w);
2774 pri = pri < EV_MINPRI ? EV_MINPRI : pri;
2775 pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
2776 ev_set_priority (w, pri);
2777 }
2778
2779 inline_speed void
2780 ev_start (EV_P_ W w, int active)
2781 {
2782 pri_adjust (EV_A_ w);
2783 w->active = active;
2784 ev_ref (EV_A);
2785 }
2786
2787 inline_size void
2788 ev_stop (EV_P_ W w)
2789 {
2790 ev_unref (EV_A);
2791 w->active = 0;
2792 }
2793
2794 /*****************************************************************************/
2795
2796 void noinline
2797 ev_io_start (EV_P_ ev_io *w)
2798 {
2799 int fd = w->fd;
2800
2801 if (expect_false (ev_is_active (w)))
2802 return;
2803
2804 assert (("libev: ev_io_start called with negative fd", fd >= 0));
2805 assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
2806
2807 EV_FREQUENT_CHECK;
2808
2809 ev_start (EV_A_ (W)w, 1);
2810 array_needsize (ANFD, anfds, anfdmax, fd + 1, array_init_zero);
2811 wlist_add (&anfds[fd].head, (WL)w);
2812
2813 fd_change (EV_A_ fd, w->events & EV__IOFDSET | EV_ANFD_REIFY);
2814 w->events &= ~EV__IOFDSET;
2815
2816 EV_FREQUENT_CHECK;
2817 }
2818
2819 void noinline
2820 ev_io_stop (EV_P_ ev_io *w)
2821 {
2822 clear_pending (EV_A_ (W)w);
2823 if (expect_false (!ev_is_active (w)))
2824 return;
2825
2826 assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
2827
2828 EV_FREQUENT_CHECK;
2829
2830 wlist_del (&anfds[w->fd].head, (WL)w);
2831 ev_stop (EV_A_ (W)w);
2832
2833 fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
2834
2835 EV_FREQUENT_CHECK;
2836 }
2837
2838 void noinline
2839 ev_timer_start (EV_P_ ev_timer *w)
2840 {
2841 if (expect_false (ev_is_active (w)))
2842 return;
2843
2844 ev_at (w) += mn_now;
2845
2846 assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
2847
2848 EV_FREQUENT_CHECK;
2849
2850 ++timercnt;
2851 ev_start (EV_A_ (W)w, timercnt + HEAP0 - 1);
2852 array_needsize (ANHE, timers, timermax, ev_active (w) + 1, EMPTY2);
2853 ANHE_w (timers [ev_active (w)]) = (WT)w;
2854 ANHE_at_cache (timers [ev_active (w)]);
2855 upheap (timers, ev_active (w));
2856
2857 EV_FREQUENT_CHECK;
2858
2859 /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
2860 }
2861
2862 void noinline
2863 ev_timer_stop (EV_P_ ev_timer *w)
2864 {
2865 clear_pending (EV_A_ (W)w);
2866 if (expect_false (!ev_is_active (w)))
2867 return;
2868
2869 EV_FREQUENT_CHECK;
2870
2871 {
2872 int active = ev_active (w);
2873
2874 assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
2875
2876 --timercnt;
2877
2878 if (expect_true (active < timercnt + HEAP0))
2879 {
2880 timers [active] = timers [timercnt + HEAP0];
2881 adjustheap (timers, timercnt, active);
2882 }
2883 }
2884
2885 ev_at (w) -= mn_now;
2886
2887 ev_stop (EV_A_ (W)w);
2888
2889 EV_FREQUENT_CHECK;
2890 }
2891
2892 void noinline
2893 ev_timer_again (EV_P_ ev_timer *w)
2894 {
2895 EV_FREQUENT_CHECK;
2896
2897 if (ev_is_active (w))
2898 {
2899 if (w->repeat)
2900 {
2901 ev_at (w) = mn_now + w->repeat;
2902 ANHE_at_cache (timers [ev_active (w)]);
2903 adjustheap (timers, timercnt, ev_active (w));
2904 }
2905 else
2906 ev_timer_stop (EV_A_ w);
2907 }
2908 else if (w->repeat)
2909 {
2910 ev_at (w) = w->repeat;
2911 ev_timer_start (EV_A_ w);
2912 }
2913
2914 EV_FREQUENT_CHECK;
2915 }
2916
2917 ev_tstamp
2918 ev_timer_remaining (EV_P_ ev_timer *w)
2919 {
2920 return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
2921 }
2922
2923 #if EV_PERIODIC_ENABLE
2924 void noinline
2925 ev_periodic_start (EV_P_ ev_periodic *w)
2926 {
2927 if (expect_false (ev_is_active (w)))
2928 return;
2929
2930 if (w->reschedule_cb)
2931 ev_at (w) = w->reschedule_cb (w, ev_rt_now);
2932 else if (w->interval)
2933 {
2934 assert (("libev: ev_periodic_start called with negative interval value", w->interval >= 0.));
2935 periodic_recalc (EV_A_ w);
2936 }
2937 else
2938 ev_at (w) = w->offset;
2939
2940 EV_FREQUENT_CHECK;
2941
2942 ++periodiccnt;
2943 ev_start (EV_A_ (W)w, periodiccnt + HEAP0 - 1);
2944 array_needsize (ANHE, periodics, periodicmax, ev_active (w) + 1, EMPTY2);
2945 ANHE_w (periodics [ev_active (w)]) = (WT)w;
2946 ANHE_at_cache (periodics [ev_active (w)]);
2947 upheap (periodics, ev_active (w));
2948
2949 EV_FREQUENT_CHECK;
2950
2951 /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
2952 }
2953
2954 void noinline
2955 ev_periodic_stop (EV_P_ ev_periodic *w)
2956 {
2957 clear_pending (EV_A_ (W)w);
2958 if (expect_false (!ev_is_active (w)))
2959 return;
2960
2961 EV_FREQUENT_CHECK;
2962
2963 {
2964 int active = ev_active (w);
2965
2966 assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
2967
2968 --periodiccnt;
2969
2970 if (expect_true (active < periodiccnt + HEAP0))
2971 {
2972 periodics [active] = periodics [periodiccnt + HEAP0];
2973 adjustheap (periodics, periodiccnt, active);
2974 }
2975 }
2976
2977 ev_stop (EV_A_ (W)w);
2978
2979 EV_FREQUENT_CHECK;
2980 }
2981
2982 void noinline
2983 ev_periodic_again (EV_P_ ev_periodic *w)
2984 {
2985 /* TODO: use adjustheap and recalculation */
2986 ev_periodic_stop (EV_A_ w);
2987 ev_periodic_start (EV_A_ w);
2988 }
2989 #endif
2990
2991 #ifndef SA_RESTART
2992 # define SA_RESTART 0
2993 #endif
2994
2995 #if EV_SIGNAL_ENABLE
2996
2997 void noinline
2998 ev_signal_start (EV_P_ ev_signal *w)
2999 {
3000 if (expect_false (ev_is_active (w)))
3001 return;
3002
3003 assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
3004
3005 #if EV_MULTIPLICITY
3006 assert (("libev: a signal must not be attached to two different loops",
3007 !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
3008
3009 signals [w->signum - 1].loop = EV_A;
3010 #endif
3011
3012 EV_FREQUENT_CHECK;
3013
3014 #if EV_USE_SIGNALFD
3015 if (sigfd == -2)
3016 {
3017 sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);
3018 if (sigfd < 0 && errno == EINVAL)
3019 sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */
3020
3021 if (sigfd >= 0)
3022 {
3023 fd_intern (sigfd); /* doing it twice will not hurt */
3024
3025 sigemptyset (&sigfd_set);
3026
3027 ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
3028 ev_set_priority (&sigfd_w, EV_MAXPRI);
3029 ev_io_start (EV_A_ &sigfd_w);
3030 ev_unref (EV_A); /* signalfd watcher should not keep loop alive */
3031 }
3032 }
3033
3034 if (sigfd >= 0)
3035 {
3036 /* TODO: check .head */
3037 sigaddset (&sigfd_set, w->signum);
3038 sigprocmask (SIG_BLOCK, &sigfd_set, 0);
3039
3040 signalfd (sigfd, &sigfd_set, 0);
3041 }
3042 #endif
3043
3044 ev_start (EV_A_ (W)w, 1);
3045 wlist_add (&signals [w->signum - 1].head, (WL)w);
3046
3047 if (!((WL)w)->next)
3048 # if EV_USE_SIGNALFD
3049 if (sigfd < 0) /*TODO*/
3050 # endif
3051 {
3052 # ifdef _WIN32
3053 evpipe_init (EV_A);
3054
3055 signal (w->signum, ev_sighandler);
3056 # else
3057 struct sigaction sa;
3058
3059 evpipe_init (EV_A);
3060
3061 sa.sa_handler = ev_sighandler;
3062 sigfillset (&sa.sa_mask);
3063 sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
3064 sigaction (w->signum, &sa, 0);
3065
3066 if (origflags & EVFLAG_NOSIGMASK)
3067 {
3068 sigemptyset (&sa.sa_mask);
3069 sigaddset (&sa.sa_mask, w->signum);
3070 sigprocmask (SIG_UNBLOCK, &sa.sa_mask, 0);
3071 }
3072 #endif
3073 }
3074
3075 EV_FREQUENT_CHECK;
3076 }
3077
3078 void noinline
3079 ev_signal_stop (EV_P_ ev_signal *w)
3080 {
3081 clear_pending (EV_A_ (W)w);
3082 if (expect_false (!ev_is_active (w)))
3083 return;
3084
3085 EV_FREQUENT_CHECK;
3086
3087 wlist_del (&signals [w->signum - 1].head, (WL)w);
3088 ev_stop (EV_A_ (W)w);
3089
3090 if (!signals [w->signum - 1].head)
3091 {
3092 #if EV_MULTIPLICITY
3093 signals [w->signum - 1].loop = 0; /* unattach from signal */
3094 #endif
3095 #if EV_USE_SIGNALFD
3096 if (sigfd >= 0)
3097 {
3098 sigset_t ss;
3099
3100 sigemptyset (&ss);
3101 sigaddset (&ss, w->signum);
3102 sigdelset (&sigfd_set, w->signum);
3103
3104 signalfd (sigfd, &sigfd_set, 0);
3105 sigprocmask (SIG_UNBLOCK, &ss, 0);
3106 }
3107 else
3108 #endif
3109 signal (w->signum, SIG_DFL);
3110 }
3111
3112 EV_FREQUENT_CHECK;
3113 }
3114
3115 #endif
3116
3117 #if EV_CHILD_ENABLE
3118
3119 void
3120 ev_child_start (EV_P_ ev_child *w)
3121 {
3122 #if EV_MULTIPLICITY
3123 assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
3124 #endif
3125 if (expect_false (ev_is_active (w)))
3126 return;
3127
3128 EV_FREQUENT_CHECK;
3129
3130 ev_start (EV_A_ (W)w, 1);
3131 wlist_add (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3132
3133 EV_FREQUENT_CHECK;
3134 }
3135
3136 void
3137 ev_child_stop (EV_P_ ev_child *w)
3138 {
3139 clear_pending (EV_A_ (W)w);
3140 if (expect_false (!ev_is_active (w)))
3141 return;
3142
3143 EV_FREQUENT_CHECK;
3144
3145 wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
3146 ev_stop (EV_A_ (W)w);
3147
3148 EV_FREQUENT_CHECK;
3149 }
3150
3151 #endif
3152
3153 #if EV_STAT_ENABLE
3154
3155 # ifdef _WIN32
3156 # undef lstat
3157 # define lstat(a,b) _stati64 (a,b)
3158 # endif
3159
3160 #define DEF_STAT_INTERVAL 5.0074891
3161 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
3162 #define MIN_STAT_INTERVAL 0.1074891
3163
3164 static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
3165
3166 #if EV_USE_INOTIFY
3167
3168 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
3169 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
3170
3171 static void noinline
3172 infy_add (EV_P_ ev_stat *w)
3173 {
3174 w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
3175
3176 if (w->wd >= 0)
3177 {
3178 struct statfs sfs;
3179
3180 /* now local changes will be tracked by inotify, but remote changes won't */
3181 /* unless the filesystem is known to be local, we therefore still poll */
3182 /* also do poll on <2.6.25, but with normal frequency */
3183
3184 if (!fs_2625)
3185 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3186 else if (!statfs (w->path, &sfs)
3187 && (sfs.f_type == 0x1373 /* devfs */
3188 || sfs.f_type == 0xEF53 /* ext2/3 */
3189 || sfs.f_type == 0x3153464a /* jfs */
3190 || sfs.f_type == 0x52654973 /* reiser3 */
3191 || sfs.f_type == 0x01021994 /* tempfs */
3192 || sfs.f_type == 0x58465342 /* xfs */))
3193 w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
3194 else
3195 w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
3196 }
3197 else
3198 {
3199 /* can't use inotify, continue to stat */
3200 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3201
3202 /* if path is not there, monitor some parent directory for speedup hints */
3203 /* note that exceeding the hardcoded path limit is not a correctness issue, */
3204 /* but an efficiency issue only */
3205 if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
3206 {
3207 char path [4096];
3208 strcpy (path, w->path);
3209
3210 do
3211 {
3212 int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
3213 | (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
3214
3215 char *pend = strrchr (path, '/');
3216
3217 if (!pend || pend == path)
3218 break;
3219
3220 *pend = 0;
3221 w->wd = inotify_add_watch (fs_fd, path, mask);
3222 }
3223 while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
3224 }
3225 }
3226
3227 if (w->wd >= 0)
3228 wlist_add (&fs_hash [w->wd & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3229
3230 /* now re-arm timer, if required */
3231 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3232 ev_timer_again (EV_A_ &w->timer);
3233 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3234 }
3235
3236 static void noinline
3237 infy_del (EV_P_ ev_stat *w)
3238 {
3239 int slot;
3240 int wd = w->wd;
3241
3242 if (wd < 0)
3243 return;
3244
3245 w->wd = -2;
3246 slot = wd & ((EV_INOTIFY_HASHSIZE) - 1);
3247 wlist_del (&fs_hash [slot].head, (WL)w);
3248
3249 /* remove this watcher, if others are watching it, they will rearm */
3250 inotify_rm_watch (fs_fd, wd);
3251 }
3252
3253 static void noinline
3254 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
3255 {
3256 if (slot < 0)
3257 /* overflow, need to check for all hash slots */
3258 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3259 infy_wd (EV_A_ slot, wd, ev);
3260 else
3261 {
3262 WL w_;
3263
3264 for (w_ = fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head; w_; )
3265 {
3266 ev_stat *w = (ev_stat *)w_;
3267 w_ = w_->next; /* lets us remove this watcher and all before it */
3268
3269 if (w->wd == wd || wd == -1)
3270 {
3271 if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
3272 {
3273 wlist_del (&fs_hash [slot & ((EV_INOTIFY_HASHSIZE) - 1)].head, (WL)w);
3274 w->wd = -1;
3275 infy_add (EV_A_ w); /* re-add, no matter what */
3276 }
3277
3278 stat_timer_cb (EV_A_ &w->timer, 0);
3279 }
3280 }
3281 }
3282 }
3283
3284 static void
3285 infy_cb (EV_P_ ev_io *w, int revents)
3286 {
3287 char buf [EV_INOTIFY_BUFSIZE];
3288 int ofs;
3289 int len = read (fs_fd, buf, sizeof (buf));
3290
3291 for (ofs = 0; ofs < len; )
3292 {
3293 struct inotify_event *ev = (struct inotify_event *)(buf + ofs);
3294 infy_wd (EV_A_ ev->wd, ev->wd, ev);
3295 ofs += sizeof (struct inotify_event) + ev->len;
3296 }
3297 }
3298
3299 inline_size void ecb_cold
3300 ev_check_2625 (EV_P)
3301 {
3302 /* kernels < 2.6.25 are borked
3303 * http://www.ussg.indiana.edu/hypermail/linux/kernel/0711.3/1208.html
3304 */
3305 if (ev_linux_version () < 0x020619)
3306 return;
3307
3308 fs_2625 = 1;
3309 }
3310
3311 inline_size int
3312 infy_newfd (void)
3313 {
3314 #if defined (IN_CLOEXEC) && defined (IN_NONBLOCK)
3315 int fd = inotify_init1 (IN_CLOEXEC | IN_NONBLOCK);
3316 if (fd >= 0)
3317 return fd;
3318 #endif
3319 return inotify_init ();
3320 }
3321
3322 inline_size void
3323 infy_init (EV_P)
3324 {
3325 if (fs_fd != -2)
3326 return;
3327
3328 fs_fd = -1;
3329
3330 ev_check_2625 (EV_A);
3331
3332 fs_fd = infy_newfd ();
3333
3334 if (fs_fd >= 0)
3335 {
3336 fd_intern (fs_fd);
3337 ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
3338 ev_set_priority (&fs_w, EV_MAXPRI);
3339 ev_io_start (EV_A_ &fs_w);
3340 ev_unref (EV_A);
3341 }
3342 }
3343
3344 inline_size void
3345 infy_fork (EV_P)
3346 {
3347 int slot;
3348
3349 if (fs_fd < 0)
3350 return;
3351
3352 ev_ref (EV_A);
3353 ev_io_stop (EV_A_ &fs_w);
3354 close (fs_fd);
3355 fs_fd = infy_newfd ();
3356
3357 if (fs_fd >= 0)
3358 {
3359 fd_intern (fs_fd);
3360 ev_io_set (&fs_w, fs_fd, EV_READ);
3361 ev_io_start (EV_A_ &fs_w);
3362 ev_unref (EV_A);
3363 }
3364
3365 for (slot = 0; slot < (EV_INOTIFY_HASHSIZE); ++slot)
3366 {
3367 WL w_ = fs_hash [slot].head;
3368 fs_hash [slot].head = 0;
3369
3370 while (w_)
3371 {
3372 ev_stat *w = (ev_stat *)w_;
3373 w_ = w_->next; /* lets us add this watcher */
3374
3375 w->wd = -1;
3376
3377 if (fs_fd >= 0)
3378 infy_add (EV_A_ w); /* re-add, no matter what */
3379 else
3380 {
3381 w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
3382 if (ev_is_active (&w->timer)) ev_ref (EV_A);
3383 ev_timer_again (EV_A_ &w->timer);
3384 if (ev_is_active (&w->timer)) ev_unref (EV_A);
3385 }
3386 }
3387 }
3388 }
3389
3390 #endif
3391
3392 #ifdef _WIN32
3393 # define EV_LSTAT(p,b) _stati64 (p, b)
3394 #else
3395 # define EV_LSTAT(p,b) lstat (p, b)
3396 #endif
3397
3398 void
3399 ev_stat_stat (EV_P_ ev_stat *w)
3400 {
3401 if (lstat (w->path, &w->attr) < 0)
3402 w->attr.st_nlink = 0;
3403 else if (!w->attr.st_nlink)
3404 w->attr.st_nlink = 1;
3405 }
3406
3407 static void noinline
3408 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
3409 {
3410 ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
3411
3412 ev_statdata prev = w->attr;
3413 ev_stat_stat (EV_A_ w);
3414
3415 /* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
3416 if (
3417 prev.st_dev != w->attr.st_dev
3418 || prev.st_ino != w->attr.st_ino
3419 || prev.st_mode != w->attr.st_mode
3420 || prev.st_nlink != w->attr.st_nlink
3421 || prev.st_uid != w->attr.st_uid
3422 || prev.st_gid != w->attr.st_gid
3423 || prev.st_rdev != w->attr.st_rdev
3424 || prev.st_size != w->attr.st_size
3425 || prev.st_atime != w->attr.st_atime
3426 || prev.st_mtime != w->attr.st_mtime
3427 || prev.st_ctime != w->attr.st_ctime
3428 ) {
3429 /* we only update w->prev on actual differences */
3430 /* in case we test more often than invoke the callback, */
3431 /* to ensure that prev is always different to attr */
3432 w->prev = prev;
3433
3434 #if EV_USE_INOTIFY
3435 if (fs_fd >= 0)
3436 {
3437 infy_del (EV_A_ w);
3438 infy_add (EV_A_ w);
3439 ev_stat_stat (EV_A_ w); /* avoid race... */
3440 }
3441 #endif
3442
3443 ev_feed_event (EV_A_ w, EV_STAT);
3444 }
3445 }
3446
3447 void
3448 ev_stat_start (EV_P_ ev_stat *w)
3449 {
3450 if (expect_false (ev_is_active (w)))
3451 return;
3452
3453 ev_stat_stat (EV_A_ w);
3454
3455 if (w->interval < MIN_STAT_INTERVAL && w->interval)
3456 w->interval = MIN_STAT_INTERVAL;
3457
3458 ev_timer_init (&w->timer, stat_timer_cb, 0., w->interval ? w->interval : DEF_STAT_INTERVAL);
3459 ev_set_priority (&w->timer, ev_priority (w));
3460
3461 #if EV_USE_INOTIFY
3462 infy_init (EV_A);
3463
3464 if (fs_fd >= 0)
3465 infy_add (EV_A_ w);
3466 else
3467 #endif
3468 {
3469 ev_timer_again (EV_A_ &w->timer);
3470 ev_unref (EV_A);
3471 }
3472
3473 ev_start (EV_A_ (W)w, 1);
3474
3475 EV_FREQUENT_CHECK;
3476 }
3477
3478 void
3479 ev_stat_stop (EV_P_ ev_stat *w)
3480 {
3481 clear_pending (EV_A_ (W)w);
3482 if (expect_false (!ev_is_active (w)))
3483 return;
3484
3485 EV_FREQUENT_CHECK;
3486
3487 #if EV_USE_INOTIFY
3488 infy_del (EV_A_ w);
3489 #endif
3490
3491 if (ev_is_active (&w->timer))
3492 {
3493 ev_ref (EV_A);
3494 ev_timer_stop (EV_A_ &w->timer);
3495 }
3496
3497 ev_stop (EV_A_ (W)w);
3498
3499 EV_FREQUENT_CHECK;
3500 }
3501 #endif
3502
3503 #if EV_IDLE_ENABLE
3504 void
3505 ev_idle_start (EV_P_ ev_idle *w)
3506 {
3507 if (expect_false (ev_is_active (w)))
3508 return;
3509
3510 pri_adjust (EV_A_ (W)w);
3511
3512 EV_FREQUENT_CHECK;
3513
3514 {
3515 int active = ++idlecnt [ABSPRI (w)];
3516
3517 ++idleall;
3518 ev_start (EV_A_ (W)w, active);
3519
3520 array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
3521 idles [ABSPRI (w)][active - 1] = w;
3522 }
3523
3524 EV_FREQUENT_CHECK;
3525 }
3526
3527 void
3528 ev_idle_stop (EV_P_ ev_idle *w)
3529 {
3530 clear_pending (EV_A_ (W)w);
3531 if (expect_false (!ev_is_active (w)))
3532 return;
3533
3534 EV_FREQUENT_CHECK;
3535
3536 {
3537 int active = ev_active (w);
3538
3539 idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
3540 ev_active (idles [ABSPRI (w)][active - 1]) = active;
3541
3542 ev_stop (EV_A_ (W)w);
3543 --idleall;
3544 }
3545
3546 EV_FREQUENT_CHECK;
3547 }
3548 #endif
3549
3550 #if EV_PREPARE_ENABLE
3551 void
3552 ev_prepare_start (EV_P_ ev_prepare *w)
3553 {
3554 if (expect_false (ev_is_active (w)))
3555 return;
3556
3557 EV_FREQUENT_CHECK;
3558
3559 ev_start (EV_A_ (W)w, ++preparecnt);
3560 array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
3561 prepares [preparecnt - 1] = w;
3562
3563 EV_FREQUENT_CHECK;
3564 }
3565
3566 void
3567 ev_prepare_stop (EV_P_ ev_prepare *w)
3568 {
3569 clear_pending (EV_A_ (W)w);
3570 if (expect_false (!ev_is_active (w)))
3571 return;
3572
3573 EV_FREQUENT_CHECK;
3574
3575 {
3576 int active = ev_active (w);
3577
3578 prepares [active - 1] = prepares [--preparecnt];
3579 ev_active (prepares [active - 1]) = active;
3580 }
3581
3582 ev_stop (EV_A_ (W)w);
3583
3584 EV_FREQUENT_CHECK;
3585 }
3586 #endif
3587
3588 #if EV_CHECK_ENABLE
3589 void
3590 ev_check_start (EV_P_ ev_check *w)
3591 {
3592 if (expect_false (ev_is_active (w)))
3593 return;
3594
3595 EV_FREQUENT_CHECK;
3596
3597 ev_start (EV_A_ (W)w, ++checkcnt);
3598 array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
3599 checks [checkcnt - 1] = w;
3600
3601 EV_FREQUENT_CHECK;
3602 }
3603
3604 void
3605 ev_check_stop (EV_P_ ev_check *w)
3606 {
3607 clear_pending (EV_A_ (W)w);
3608 if (expect_false (!ev_is_active (w)))
3609 return;
3610
3611 EV_FREQUENT_CHECK;
3612
3613 {
3614 int active = ev_active (w);
3615
3616 checks [active - 1] = checks [--checkcnt];
3617 ev_active (checks [active - 1]) = active;
3618 }
3619
3620 ev_stop (EV_A_ (W)w);
3621
3622 EV_FREQUENT_CHECK;
3623 }
3624 #endif
3625
3626 #if EV_EMBED_ENABLE
3627 void noinline
3628 ev_embed_sweep (EV_P_ ev_embed *w)
3629 {
3630 ev_run (w->other, EVRUN_NOWAIT);
3631 }
3632
3633 static void
3634 embed_io_cb (EV_P_ ev_io *io, int revents)
3635 {
3636 ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
3637
3638 if (ev_cb (w))
3639 ev_feed_event (EV_A_ (W)w, EV_EMBED);
3640 else
3641 ev_run (w->other, EVRUN_NOWAIT);
3642 }
3643
3644 static void
3645 embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents)
3646 {
3647 ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare));
3648
3649 {
3650 EV_P = w->other;
3651
3652 while (fdchangecnt)
3653 {
3654 fd_reify (EV_A);
3655 ev_run (EV_A_ EVRUN_NOWAIT);
3656 }
3657 }
3658 }
3659
3660 static void
3661 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
3662 {
3663 ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
3664
3665 ev_embed_stop (EV_A_ w);
3666
3667 {
3668 EV_P = w->other;
3669
3670 ev_loop_fork (EV_A);
3671 ev_run (EV_A_ EVRUN_NOWAIT);
3672 }
3673
3674 ev_embed_start (EV_A_ w);
3675 }
3676
3677 #if 0
3678 static void
3679 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
3680 {
3681 ev_idle_stop (EV_A_ idle);
3682 }
3683 #endif
3684
3685 void
3686 ev_embed_start (EV_P_ ev_embed *w)
3687 {
3688 if (expect_false (ev_is_active (w)))
3689 return;
3690
3691 {
3692 EV_P = w->other;
3693 assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
3694 ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ);
3695 }
3696
3697 EV_FREQUENT_CHECK;
3698
3699 ev_set_priority (&w->io, ev_priority (w));
3700 ev_io_start (EV_A_ &w->io);
3701
3702 ev_prepare_init (&w->prepare, embed_prepare_cb);
3703 ev_set_priority (&w->prepare, EV_MINPRI);
3704 ev_prepare_start (EV_A_ &w->prepare);
3705
3706 ev_fork_init (&w->fork, embed_fork_cb);
3707 ev_fork_start (EV_A_ &w->fork);
3708
3709 /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
3710
3711 ev_start (EV_A_ (W)w, 1);
3712
3713 EV_FREQUENT_CHECK;
3714 }
3715
3716 void
3717 ev_embed_stop (EV_P_ ev_embed *w)
3718 {
3719 clear_pending (EV_A_ (W)w);
3720 if (expect_false (!ev_is_active (w)))
3721 return;
3722
3723 EV_FREQUENT_CHECK;
3724
3725 ev_io_stop (EV_A_ &w->io);
3726 ev_prepare_stop (EV_A_ &w->prepare);
3727 ev_fork_stop (EV_A_ &w->fork);
3728
3729 ev_stop (EV_A_ (W)w);
3730
3731 EV_FREQUENT_CHECK;
3732 }
3733 #endif
3734
3735 #if EV_FORK_ENABLE
3736 void
3737 ev_fork_start (EV_P_ ev_fork *w)
3738 {
3739 if (expect_false (ev_is_active (w)))
3740 return;
3741
3742 EV_FREQUENT_CHECK;
3743
3744 ev_start (EV_A_ (W)w, ++forkcnt);
3745 array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
3746 forks [forkcnt - 1] = w;
3747
3748 EV_FREQUENT_CHECK;
3749 }
3750
3751 void
3752 ev_fork_stop (EV_P_ ev_fork *w)
3753 {
3754 clear_pending (EV_A_ (W)w);
3755 if (expect_false (!ev_is_active (w)))
3756 return;
3757
3758 EV_FREQUENT_CHECK;
3759
3760 {
3761 int active = ev_active (w);
3762
3763 forks [active - 1] = forks [--forkcnt];
3764 ev_active (forks [active - 1]) = active;
3765 }
3766
3767 ev_stop (EV_A_ (W)w);
3768
3769 EV_FREQUENT_CHECK;
3770 }
3771 #endif
3772
3773 #if EV_CLEANUP_ENABLE
3774 void
3775 ev_cleanup_start (EV_P_ ev_cleanup *w)
3776 {
3777 if (expect_false (ev_is_active (w)))
3778 return;
3779
3780 EV_FREQUENT_CHECK;
3781
3782 ev_start (EV_A_ (W)w, ++cleanupcnt);
3783 array_needsize (ev_cleanup *, cleanups, cleanupmax, cleanupcnt, EMPTY2);
3784 cleanups [cleanupcnt - 1] = w;
3785
3786 /* cleanup watchers should never keep a refcount on the loop */
3787 ev_unref (EV_A);
3788 EV_FREQUENT_CHECK;
3789 }
3790
3791 void
3792 ev_cleanup_stop (EV_P_ ev_cleanup *w)
3793 {
3794 clear_pending (EV_A_ (W)w);
3795 if (expect_false (!ev_is_active (w)))
3796 return;
3797
3798 EV_FREQUENT_CHECK;
3799 ev_ref (EV_A);
3800
3801 {
3802 int active = ev_active (w);
3803
3804 cleanups [active - 1] = cleanups [--cleanupcnt];
3805 ev_active (cleanups [active - 1]) = active;
3806 }
3807
3808 ev_stop (EV_A_ (W)w);
3809
3810 EV_FREQUENT_CHECK;
3811 }
3812 #endif
3813
3814 #if EV_ASYNC_ENABLE
3815 void
3816 ev_async_start (EV_P_ ev_async *w)
3817 {
3818 if (expect_false (ev_is_active (w)))
3819 return;
3820
3821 w->sent = 0;
3822
3823 evpipe_init (EV_A);
3824
3825 EV_FREQUENT_CHECK;
3826
3827 ev_start (EV_A_ (W)w, ++asynccnt);
3828 array_needsize (ev_async *, asyncs, asyncmax, asynccnt, EMPTY2);
3829 asyncs [asynccnt - 1] = w;
3830
3831 EV_FREQUENT_CHECK;
3832 }
3833
3834 void
3835 ev_async_stop (EV_P_ ev_async *w)
3836 {
3837 clear_pending (EV_A_ (W)w);
3838 if (expect_false (!ev_is_active (w)))
3839 return;
3840
3841 EV_FREQUENT_CHECK;
3842
3843 {
3844 int active = ev_active (w);
3845
3846 asyncs [active - 1] = asyncs [--asynccnt];
3847 ev_active (asyncs [active - 1]) = active;
3848 }
3849
3850 ev_stop (EV_A_ (W)w);
3851
3852 EV_FREQUENT_CHECK;
3853 }
3854
3855 void
3856 ev_async_send (EV_P_ ev_async *w)
3857 {
3858 w->sent = 1;
3859 evpipe_write (EV_A_ &async_pending);
3860 }
3861 #endif
3862
3863 /*****************************************************************************/
3864
3865 struct ev_once
3866 {
3867 ev_io io;
3868 ev_timer to;
3869 void (*cb)(int revents, void *arg);
3870 void *arg;
3871 };
3872
3873 static void
3874 once_cb (EV_P_ struct ev_once *once, int revents)
3875 {
3876 void (*cb)(int revents, void *arg) = once->cb;
3877 void *arg = once->arg;
3878
3879 ev_io_stop (EV_A_ &once->io);
3880 ev_timer_stop (EV_A_ &once->to);
3881 ev_free (once);
3882
3883 cb (revents, arg);
3884 }
3885
3886 static void
3887 once_cb_io (EV_P_ ev_io *w, int revents)
3888 {
3889 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io));
3890
3891 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->to));
3892 }
3893
3894 static void
3895 once_cb_to (EV_P_ ev_timer *w, int revents)
3896 {
3897 struct ev_once *once = (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to));
3898
3899 once_cb (EV_A_ once, revents | ev_clear_pending (EV_A_ &once->io));
3900 }
3901
3902 void
3903 ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
3904 {
3905 struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
3906
3907 if (expect_false (!once))
3908 {
3909 cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMER, arg);
3910 return;
3911 }
3912
3913 once->cb = cb;
3914 once->arg = arg;
3915
3916 ev_init (&once->io, once_cb_io);
3917 if (fd >= 0)
3918 {
3919 ev_io_set (&once->io, fd, events);
3920 ev_io_start (EV_A_ &once->io);
3921 }
3922
3923 ev_init (&once->to, once_cb_to);
3924 if (timeout >= 0.)
3925 {
3926 ev_timer_set (&once->to, timeout, 0.);
3927 ev_timer_start (EV_A_ &once->to);
3928 }
3929 }
3930
3931 /*****************************************************************************/
3932
3933 #if EV_WALK_ENABLE
3934 void ecb_cold
3935 ev_walk (EV_P_ int types, void (*cb)(EV_P_ int type, void *w))
3936 {
3937 int i, j;
3938 ev_watcher_list *wl, *wn;
3939
3940 if (types & (EV_IO | EV_EMBED))
3941 for (i = 0; i < anfdmax; ++i)
3942 for (wl = anfds [i].head; wl; )
3943 {
3944 wn = wl->next;
3945
3946 #if EV_EMBED_ENABLE
3947 if (ev_cb ((ev_io *)wl) == embed_io_cb)
3948 {
3949 if (types & EV_EMBED)
3950 cb (EV_A_ EV_EMBED, ((char *)wl) - offsetof (struct ev_embed, io));
3951 }
3952 else
3953 #endif
3954 #if EV_USE_INOTIFY
3955 if (ev_cb ((ev_io *)wl) == infy_cb)
3956 ;
3957 else
3958 #endif
3959 if ((ev_io *)wl != &pipe_w)
3960 if (types & EV_IO)
3961 cb (EV_A_ EV_IO, wl);
3962
3963 wl = wn;
3964 }
3965
3966 if (types & (EV_TIMER | EV_STAT))
3967 for (i = timercnt + HEAP0; i-- > HEAP0; )
3968 #if EV_STAT_ENABLE
3969 /*TODO: timer is not always active*/
3970 if (ev_cb ((ev_timer *)ANHE_w (timers [i])) == stat_timer_cb)
3971 {
3972 if (types & EV_STAT)
3973 cb (EV_A_ EV_STAT, ((char *)ANHE_w (timers [i])) - offsetof (struct ev_stat, timer));
3974 }
3975 else
3976 #endif
3977 if (types & EV_TIMER)
3978 cb (EV_A_ EV_TIMER, ANHE_w (timers [i]));
3979
3980 #if EV_PERIODIC_ENABLE
3981 if (types & EV_PERIODIC)
3982 for (i = periodiccnt + HEAP0; i-- > HEAP0; )
3983 cb (EV_A_ EV_PERIODIC, ANHE_w (periodics [i]));
3984 #endif
3985
3986 #if EV_IDLE_ENABLE
3987 if (types & EV_IDLE)
3988 for (j = NUMPRI; i--; )
3989 for (i = idlecnt [j]; i--; )
3990 cb (EV_A_ EV_IDLE, idles [j][i]);
3991 #endif
3992
3993 #if EV_FORK_ENABLE
3994 if (types & EV_FORK)
3995 for (i = forkcnt; i--; )
3996 if (ev_cb (forks [i]) != embed_fork_cb)
3997 cb (EV_A_ EV_FORK, forks [i]);
3998 #endif
3999
4000 #if EV_ASYNC_ENABLE
4001 if (types & EV_ASYNC)
4002 for (i = asynccnt; i--; )
4003 cb (EV_A_ EV_ASYNC, asyncs [i]);
4004 #endif
4005
4006 #if EV_PREPARE_ENABLE
4007 if (types & EV_PREPARE)
4008 for (i = preparecnt; i--; )
4009 # if EV_EMBED_ENABLE
4010 if (ev_cb (prepares [i]) != embed_prepare_cb)
4011 # endif
4012 cb (EV_A_ EV_PREPARE, prepares [i]);
4013 #endif
4014
4015 #if EV_CHECK_ENABLE
4016 if (types & EV_CHECK)
4017 for (i = checkcnt; i--; )
4018 cb (EV_A_ EV_CHECK, checks [i]);
4019 #endif
4020
4021 #if EV_SIGNAL_ENABLE
4022 if (types & EV_SIGNAL)
4023 for (i = 0; i < EV_NSIG - 1; ++i)
4024 for (wl = signals [i].head; wl; )
4025 {
4026 wn = wl->next;
4027 cb (EV_A_ EV_SIGNAL, wl);
4028 wl = wn;
4029 }
4030 #endif
4031
4032 #if EV_CHILD_ENABLE
4033 if (types & EV_CHILD)
4034 for (i = (EV_PID_HASHSIZE); i--; )
4035 for (wl = childs [i]; wl; )
4036 {
4037 wn = wl->next;
4038 cb (EV_A_ EV_CHILD, wl);
4039 wl = wn;
4040 }
4041 #endif
4042 /* EV_STAT 0x00001000 /* stat data changed */
4043 /* EV_EMBED 0x00010000 /* embedded event loop needs sweep */
4044 }
4045 #endif
4046
4047 #if EV_MULTIPLICITY
4048 #include "ev_wrap.h"
4049 #endif
4050
4051 EV_CPP(})
4052